2. Pick a lesson
3rd grade math has 225 lessons - and each lesson has 500 problems, explanations, and an instructional video.
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Number Sense28 lessons
Basic Comparison Choose the best answer.
10 is 7
Lesson PreviewTens and Ones Places Fill in the blanks.
The number 17 has ten and ones.
Lesson PreviewGreater Than & Less Than What words should fill in the blank?
84 81
Lesson PreviewOrdering Numbers Put these numbers in order from lowest to greatest.
72, 70, 83
Lesson PreviewComparison and Ordering, to Two Hundred What words should fill in the blank?
66 59
Lesson PreviewRounding to the Nearest Ten Round to the nearest ten.
95 rounds to .
Lesson PreviewEven and Odd Numbers Is 98 an even number or an odd number?
Lesson PreviewPlace Value Through Hundreds What number has 9 hundreds, 8 tens, and 0 ones?
Lesson PreviewComparing Numbers up to One Thousand Fill in the blank with <, >, or =.
699 630.
Lesson PreviewCounting By Twos, Fives and Tens What comes next? Count two at a time.
85, 87, 89, , ,
Lesson PreviewPatterns and Counting By Twos, Fives and Tens Fill in the blanks to complete the pattern.
60, 59, , 57, ,
Lesson PreviewReview Place Value Below One Thousand What number has 9 hundreds, 8 tens, and 0 ones?
Lesson PreviewPlace Value Below Ten Thousand What number has 8 thousands, 1 hundreds, 2 tens, and 8 ones?
Lesson PreviewComparing Numbers Below Ten Thousand Fill in the blank
1,612 9,270
Lesson PreviewRounding Round 8,360 to the nearest ten.
Lesson PreviewRounding and Estimation Estimate the sum by rounding each number to the nearest ten.
13 + 59 =
Lesson PreviewPlace value through hundred thousands Arrange the following numbers from greatest to least.
5,970; 3,504; 2,858; 7,212; 8,114
, , , ,Lesson PreviewPlace value through hundred millions Complete the patterns by filling in the blanks.
112,022,496; 112,023,496; ; 112,025,496;
Lesson PreviewComparing whole numbers Choose the answer that correctly fills in the blank.
436,583,279 422,403,705
Lesson PreviewRounding whole numbers Fill in the blank.
98 is when rounded to the nearest ten
Lesson PreviewAddition using commutative, associative, and zero properties Evaluate the expression
984 - 317 - 0
Lesson PreviewEstimation for addition Round off each number to the hundreds. Then perform the math function to estimate the result
998 - 923 =
Lesson PreviewEstimation for subtraction Estimate the difference of the equation below by rounding each number to the hundreds place.
5,653 - 4,517 =
Lesson PreviewComparing Negative Numbers Choose the answer that correctly fills in the blank.
-1 -6
Lesson PreviewProbability If there are 2 squares, 8 triangles, and 4 circles in a box, what is the probability of choosing a square? Do not simplify.Lesson PreviewPlace Value Through Billions Choose the answer that correctly fills in the blank.
436,583,279 422,403,705
Lesson PreviewPlace Value Through Thousandths In the number 702.470, which digit is in the tenths place?
Lesson PreviewRounding Whole Numbers Fill in the blank.
98 is when rounded to the nearest ten
Lesson Preview -
Addition27 lessonsAdding Tens and Ones
What number is 1 more than 10?
Lesson PreviewAdding Below Six What is 1 + 2?
Lesson PreviewAdding Below Ten What is 1 + 1?
Lesson PreviewAdding With Zero What is 4 + 0?
Lesson PreviewAddition By Counting Fill in the blanks with the numbers that come next. Then use the counting numbers to help you add.
4, , , . What is 4 + 3?
Lesson PreviewDoubling What is 1 + 1?
Lesson PreviewDoubling Below Twenty What is 5 + 5 =
Lesson PreviewBasic Associative Property Can you think of another way to write 5 + 4?
5 + 4 = +
Lesson PreviewAdding Below Twenty What is 1 + 2?
Lesson PreviewAdding Three Numbers 1 + 6 + 4 =
Lesson PreviewAddition Below Fifty With Carrying What is 15 + 6?
Lesson PreviewAddition Below One Hundred What is 14 + 5?
Lesson PreviewMissing Addends Fill in the missing number in the addition problem.
5 + = 12
Lesson PreviewRewriting Addition as Plus Ten Rewrite the addition problem as some number plus ten.
6 + 7 = 10 +
Lesson PreviewAdding Three Numbers 4 + 1 + 1 =
Lesson PreviewTwo-Digit Addition What is 45 + 33?
Lesson PreviewTwo-Digit Addition With Carrying What is 58 + 33?
Lesson PreviewAdding Tens What is 30 + 40?
Lesson PreviewRounding and Addition Round 76 to the nearest ten.
Lesson PreviewAdding Three Two-Digit Numbers What is 34 + 48 + 4?
Lesson PreviewAdding Hundreds 400 + 100 =
Lesson PreviewAdding Hundreds With Carrying 686 + 151 =
Lesson PreviewAddition Review Round both 21 and 37 to the nearest ten.
21 rounds to and 37 rounds to .
Then, add the rounded numbers to estimate the sum. The sum of the rounded numbers isLesson PreviewAddition and Inequalities Fill in the blank
35 + 94 70 + 58
Lesson PreviewProperties of Addition What property of addition does
23 + 60 = 60 + 23reflect?Lesson PreviewAddition Up To Ten Thousand 2,778 + 2,428 =
Lesson PreviewAdding Money $4.30 + $1.36 = $
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Subtraction27 lessonsSubtraction Below Five
What is 5 - 2?
Lesson PreviewSubtraction Below Ten What is 10 - 8?
Lesson PreviewSubtraction As Inverse of Addition If 3 + 3 = 6, what is 6 - 3?
Lesson PreviewSubtracting Zero or All What is 2 - 0?
Lesson PreviewSubtracting By Counting Fill in the blanks by counting backwards. Then use the counting numbers to help you subtract.
9, , , . What is 9 - 3?
Lesson PreviewVertical Addition and Subtraction Solve the problem
5+ 3-----Lesson PreviewAddition and Subtraction Below Fifty What is 21 + 3?
Lesson PreviewSubtraction Below Twenty What is 8 - 2?
Lesson PreviewSubtraction Below Fifty With Regrouping What is 45 - 6?
Lesson PreviewSubtraction Below One Hundred What is 67 - 1?
Lesson PreviewRelating Addition and Subtraction If 5 + 10 = 15, what is 10 + 5 equal to?
Lesson PreviewPlace Value and Regrouping What is the value of the tens place in the number 96 (for example, the value of the tens place in 28 is 20)? What is the value of the ones digit?
Lesson PreviewSubtracting Hundreds 900 - 800 =
Lesson PreviewSubtracting Hundreds With Regrouping 849 - 788 =
Lesson PreviewSubtracting With Regrouping And Zeroes 985 - 694 =
Lesson PreviewSubtraction Review and Vertical Form Find the difference.
700
- 100
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Lesson PreviewTwo-Digit Subtraction What is 41 - 20?
Lesson PreviewTwo-Digit Subtraction With Regrouping What is 83 - 65?
Lesson PreviewRounding and Subtraction Round both 92 and 52 to the nearest ten.
92 rounds to and 52 rounds to .
Then, subtract the rounded numbers to estimate the difference. The difference of the rounded numbers isLesson PreviewChecking Subtraction With Addition What is 75 - 25? Check your answer by adding 50 + 25. What is 50 + 25?
Lesson PreviewSubtracting Tens What is 80 - 40?
Lesson PreviewTwo-Digit Addition and Subtraction Review What is 16 + 50?
Lesson PreviewSubtraction Review 900 - 800 =
Lesson PreviewSubtraction Up To Ten Thousand 9,275 - 2,361 =
Lesson PreviewSubtracting Money $6.27 - $4.27 = $
Lesson PreviewSubtract whole numbers Evaluate the expression
813 - 477
Lesson PreviewSubtract across zeroes Evaluate the expression
540 - 79
Lesson Preview -
Multiplication18 lessonsBasic Multiplication
What is 5 × 4?
Lesson PreviewCounting to Multiply Count by 2s to help you multiply 2 × 6.
2, 4, , , , . What is 2 × 6?
Lesson PreviewMultiplying By Two, Five, or Ten What is 2 + 2 + 2?
Lesson PreviewMultiplication Word Problems If you have 2 boxes, and put 6 apples into each box, how many apples do you have?
Lesson PreviewMultiplying By Two, Four, Five and Ten What is 2 × 6?
Lesson PreviewMultiplying By Zero and One 1 × 5 =
Lesson PreviewMultiplying By Three and Nine 3 × 10 =
Lesson PreviewMultiplying By Six, Seven and Eight 6 × 3 =
Lesson PreviewMultiplication Practice 0 × 2 =
Lesson PreviewProperties of Multiplication What is 3 × (3 × 8)? What is (3 × 3) × 8?
Lesson PreviewUsing Multiplication To Divide If 3 × 5 = 15, what is 15 ÷ 5?
Lesson PreviewMultiplication of 2-digit numbers by 1-digit numbers 2 × 33 =
Lesson PreviewMultiplication of 3-digit numbers by 1-digit numbers 2 × 431 =
Lesson PreviewMultiplication Practice 5 × 31 =
Lesson PreviewMultiplication and division facts 4 × 4 =
Lesson PreviewMultiplication properties and division rules 4,925 × 1,401 = × 4,925
Lesson PreviewMultiplying by 2-digit numbers Evaluate the expression
65 × 4 =
Lesson PreviewEstimation using multiplication Estimate the product of the equation below by rounding each number to the tens place.
71 × 18 =
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Division14 lessonsBasic Division
2)10
The quotient is .Lesson PreviewCounting Backwards to Divide Count backwards by 4s all the way to 0 to help you divide 20 ÷ 4.
20, 16, , , , . What is 20 ÷ 4?
Lesson PreviewRemainders If you divide 13 apples into 2 equal groups, how many apples are left over at the end?
appleLesson PreviewDivision Definitions In the division equation 32 ÷ 4 = 8, what is the dividend?
Lesson PreviewDividing By Two, Five and Ten 2 ÷ 2 =
Lesson PreviewDividing By Three, Four and Nine 6 ÷ 3 =
Lesson PreviewDividing By Six, Seven and Eight 16 ÷ 8 =
Lesson PreviewDividing With One and Zero 6 ÷ 6 =
Lesson PreviewDivision 1 )6
What is the quotient?
What is the remainder?Lesson PreviewDividing Two-Digit Numbers Find both the quotient and remainder.
11 ÷ 1
What is the quotient?
What is the remainder?
Lesson PreviewDividing Three-Digit Numbers Find both the quotient and remainder.
562 ÷ 3
What is the quotient?
What is the remainder?
Lesson PreviewDivision with remainders Calculate the quotient and remainder
2 )22. What is the quotient? What is the remainder? Lesson PreviewDivision with quotients with zeroes 1)9,097
Quotient = , Remainder =Lesson PreviewDeciding where to place the first digit in division 8)1,657
Quotient = , Remainder =Lesson Preview -
Geometry36 lessonsIdentify Solid Figures
Identify the shape of the figure:
Lesson PreviewIdentify Shapes What is the name of the figure?
Lesson PreviewCounting Sides and Vertices of Plane Shapes How many sides in the figure?
Lesson PreviewCounting Vertices, Edges, Faces How many vertices in the figure?
Lesson PreviewComparing Vertices, Edges, Faces Which figure has more vertices?
Figure 1 Figure 2 
Lesson PreviewPlane Shapes and Solid Figures What shape can you trace from this solid figure?
Lesson PreviewPolygons Classify the polygon.
Lesson PreviewPerimeter of Squares Find the perimeter of the shaded figure.
unitsLesson PreviewPerimeter of Shapes Find the perimeter of the figure.
cmLesson PreviewArea of Squares Find the area of the shaded figure.
square unitsLesson PreviewArea of Shapes What is the area of a rectangle with length 4yd and width 5yd? yd2.
Lesson PreviewTriangles Identify the type of triangle.
Lesson PreviewQuadrilaterals Identify the type of quadrilateral.
Lesson PreviewSolid Figures Identify the solid figure.
Lesson PreviewFaces, Edges, Vertices For the given figure, find the number of faces, edges, and vertices:
Lesson PreviewIdentify Solid Figures Identify the figure:
Lesson PreviewPolygon Review Classify the polygon.
Lesson PreviewLines, Line Segments, Rays Is this figure a line, line segment or ray?
Lesson PreviewParallel, Perpendicular, Intersecting Lines Which answer most accurately describes the figure shown?
Lesson PreviewAngles Classify this angle as right, acute or obtuse:
Lesson PreviewTriangles Review Identify the type of triangle.
Lesson PreviewQuadrilaterals Review Identify the type of quadrilateral.
Lesson PreviewCircle Parts Identify the part of the circle.
Lesson PreviewCongruence Are these shapes congruent?
Lesson PreviewAngles Review Classify this angle as right, acute or obtuse:
Lesson PreviewEstimating Angles Estimate the measure of the angle:
Lesson PreviewParallel, Perpendicular, Intersecting Lines If angle X = 132, then angle Y =
Lesson PreviewTriangles Review Identify the type of triangle.
Lesson PreviewTriangle Angles Find the value of x.
degreesLesson PreviewQuadrilateral Angles Find the value of x.
degreesLesson PreviewArea of Triangles What is the area of this triangle?
cm2Lesson PreviewArea of Parallelograms and Trapezoids What is the area of this trapezoid if the height is 8 ft?
ft2Lesson PreviewVolume of Cubes and Rectangular Prisms What is the volume of this cube with width = 6m?
m3Lesson PreviewSurface area of Cubes and Rectangular Prisms What is the surface area of this cube with width = 4yd?
yd2Lesson PreviewCircumference of a Circle What is the circumference of a circle with diameter = 12m, using 3.14 for
?
mLesson PreviewArea of a Circle What is the area of a circle with radius = 7m, using 3.14 for
?
m2Lesson Preview
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Time18 lessonsTelling time I - hours What time does the clock show?
Lesson PreviewTelling time II - half hours What time does the clock show?
Lesson PreviewElapsed time I - hours Jude started working at the time shown on the first clock and finished at the time shown on the second clock. How long did Jude work for?
Start time:
Finish time:
Lesson PreviewDays of the week Today is Tuesday. What day is tomorrow?
Lesson PreviewReading a calendar Use the calendar to answer the question.
What day of the week is August 18th?
Lesson PreviewReading a calendar II What date is just after Sunday, October 17th?
Lesson PreviewUsing a schedule Use the table.
What time does Toy Story start?
Movie Schedule Movie Start time Toy Story 10:00 Ratatouille 12:00 Beauty and the Beast 2:00 Hook 4:00 Tangled 6:00 Lesson PreviewElapsed time II - hours and half hours Joel started working at the time shown on the first clock and finished at the time shown on the second clock. How long did Joel work for?
Start time:
Finish time:
Lesson PreviewMonths What is the 10th month of the year?
Lesson PreviewComparing units of time Which is the longer amount of time?
Lesson PreviewUsing a schedule II Use the table.
Ratatouille starts 2 hours after Beauty and the Beast. What time does Ratatouille start?
Movie Schedule Movie Start time Beauty and the Beast 9:00 Hook 11:00 Finding Nemo 1:00 Tangled 3:00 The Little Mermaid 5:00 Lesson PreviewElapsed time III - quarter hours Victor started walking at 3:15 and finishes at 5:45. How long did Victor walk?
hours and minutesLesson PreviewConverting minutes and hours II Answer the question by creating as many whole hours as you can and then finding how many minutes remain.
How many hours and minutes are in 193 minutes? hours and minutes
Lesson PreviewElapsed time IV - 5 minute intervals Jimmy started reading at 7:15 and finishes at 8:40. How long did Jimmy read?
hours and minutesLesson PreviewElapsed time V - minute intervals Elena started walking at 7:26 and finishes at 10:19. How long did Elena walk?
hours and minutesLesson PreviewConverting minutes and hours II Answer the question by creating as many whole hours as you can and then finding how many minutes remain.
How many hours and minutes are in 193 minutes? hours and minutes
Lesson PreviewElapsed time IV - 5 minute intervals Jimmy started reading at 7:15 and finishes at 8:40. How long did Jimmy read?
hours and minutesLesson PreviewElapsed time V - minute intervals Elena started walking at 7:26 and finishes at 10:19. How long did Elena walk?
hours and minutesLesson Preview -
Measurement23 lessonsIntroduction to weight
Which is heavier?
swimming pool
orange
Lesson PreviewCustomary weight - choose the best unit of measure Which unit of weight is more appropriate for weighing a horse?
Lesson PreviewCustomary weight - choose the best estimate Which is the better estimate for the weight of a strawberry?
Lesson PreviewMetric weight - choose the best unit of measure Which unit of weight is more appropriate for weighing a wizard hat?
Lesson PreviewMetric weight - choose the best estimate Which is the better estimate for the weight of a horse?
Lesson PreviewCustomary distance - choose the best unit of measure Which unit is better for measuring the width of a folder?
Lesson PreviewCustomary distance - choose the best estimate Which is the better estimate for the length of a car?
Lesson PreviewMetric distance - choose the best estimate Which is the better estimate for the length of a truck?
Lesson PreviewMetric distance - choose the best unit of measure Which unit is better for measuring the height of a mountain?
Lesson PreviewCustomary capacity - choose the best estimate Which is the better estimate for the capacity of a juice carton?
Lesson PreviewMetric capacity - choose the best estimate Which is the better estimate for the capacity of a fish tank?
Lesson PreviewTemperature Which is the better temperature go for a run?
Lesson PreviewCustomary weight - choose the best unit of measure Which unit of weight is more appropriate for weighing a horse?
Lesson PreviewCustomary weight - choose the best estimate Which is the better estimate for the weight of a strawberry?
Lesson PreviewMetric weight - choose the best unit of measure Which unit of weight is more appropriate for weighing a wizard hat?
Lesson PreviewMetric weight - choose the best estimate Which is the better estimate for the weight of a horse?
Lesson PreviewCustomary distance - choose the best unit of measure Which unit is better for measuring the width of a folder?
Lesson PreviewCustomary distance - choose the best estimate Which is the better estimate for the length of a car?
Lesson PreviewMetric distance - choose the best estimate Which is the better estimate for the length of a truck?
Lesson PreviewMetric distance - choose the best unit of measure Which unit is better for measuring the height of a mountain?
Lesson PreviewCustomary capacity - choose the best estimate Which is the better estimate for the capacity of a juice carton?
Lesson PreviewMetric capacity - choose the best estimate Which is the better estimate for the capacity of a fish tank?
Lesson PreviewTemperature Which is the better temperature go for a run?
Lesson Preview -
Fractions And Decimals6 lessonsEquivalent Fractions
Choose the answer that fills in the blank.
1224Lesson PreviewComparing Fractions Choose the answer that fills in the blank with <, > or =.
6838Lesson PreviewAdding Fractions Solve the problem, do not simplify.
+39=19Lesson PreviewSubtracting Fractions Solve the problem, do not simplify.
-47=27Lesson PreviewTenths and Hundredths Writeas a decimal.710Lesson PreviewTenths, Hundredths, and Money Write the value of two quarters as a fraction, with 100 as a denominator.Lesson Preview -
Other6 lessonsSquares
7 × 7 = 7 with the exponent of
Lesson PreviewPowers of Ten 3 × 5 =3 × 50 =3 × 500 =3 × 5,000 =Lesson PreviewUnit Conversion How many minutes are there in 7 hours? minutes
Lesson PreviewMetric Unit Conversion How many grams are there in 9 kilograms?
gramsLesson PreviewTwo Digit Divisors 39)273 = Lesson PreviewMean, Median and Mode What is the mean of the set { 11, 10, 7, 9, 13 }?
Lesson Preview -
Algebra22 lessonsExpressions using parentheses
Evaluate the expression
(735 + 688) + 240
Lesson PreviewAdding equals to both sides of an equation (936 + 426) + 255 = 936 +
Lesson PreviewEvaluating expressions with all four operations Evaluate the expression.
6 + 5 + (9 - 8) × 8
Lesson PreviewUsing variables and evaluating expressions using variables Evaluate the expression
a - 1 = , where a=3
Lesson PreviewOrder of Operations 12 + 3 × 5 =
Lesson PreviewExpressions in Word Problems Write an algebraic expression that describes the following word phrase, using the letter `a` for the unknown number.
nine times a number minus two = a -
Lesson PreviewEquations with variables Solve the equation.
x + 14 = 14, x =
Lesson PreviewDistributive Property Use the distributive property to fill in the blank.
2 × 26 = (2 × 18) + (2 × )
Lesson PreviewCommutative Properties of Addition and Multiplication Fill in the blank.
54 × 73 = 73 ×
Lesson PreviewAssociative Properties of Addition and Multiplication Fill in the blank.
48 + (2 + 50) = (48 + 2) +
Lesson PreviewIdentity Properties and Multiplication by Zero Fill in the blank.
3,894 + 0 =
Lesson PreviewRounding Decimals Round to the underlined digit
4.4109 =
Lesson PreviewEstimating decimal addition and subtraction Estimate the sum by rounding each number to the nearest whole. Give your answer as a whole number.
5.474 + 3.957 ≈
Lesson PreviewOrder of Operations Review 12 + 3 × 5 =
Lesson PreviewProperties Review Use the distributive property to fill in the blank.
2 × 26 = (2 × 18) + (2 × )
Lesson PreviewAlgebraic Expressions Evaluate the expression -3x - 14 when x = 11.
Lesson PreviewSimplifying Algebraic Expressions In the expression -21x + 37, what is the coefficient of x?
What is the constant term?Lesson PreviewAlgebraic Formulas Use the formula P = 2l + 2w to find the perimeter of a rectangle with the following dimensions: Length 9, Width 17 =
Lesson PreviewSolving Addition and Subtraction Equations Solve the equation.
x + 12 = 15, x =
Lesson PreviewSolving Multiplication and Division Equations Solve the equation.
7y = 7 × -1, y =
Lesson PreviewRatios How would you write the ratio of 32 to 73 in ratio form? Do not simplify the ratio.
Lesson PreviewCross Products Solve for x.
=x30, x =1915Lesson Preview
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