My birthday party is tomorrow! Will you bring me cake? (Psst..there is cake at the end of the level)
30
50
75
85
Watch a video to learn "Subtraction Below Twenty"
Source: AdaptedMind
1st Grade skills
- Counting 6
-
Number Sense
28
- Basic Comparison
- Tens and Ones Places
- Greater Than & Less Than
- Ordering Numbers
- Comparison and Ordering, to Two Hundred
- Rounding to the Nearest Ten
- Even and Odd Numbers
- Place Value Through Hundreds
- Comparing Numbers up to One Thousand
- Counting By Twos, Fives and Tens
- Patterns and Counting By Twos, Fives and Tens
- Review Place Value Below One Thousand
- Place Value Below Ten Thousand
- Comparing Numbers Below Ten Thousand
- Rounding
- Rounding and Estimation
- Place value through hundred thousands
- Place value through hundred millions
- Comparing whole numbers
- Rounding whole numbers
- Addition using commutative, associative, and zero properties
- Estimation for addition
- Estimation for subtraction
- Comparing Negative Numbers
- Probability
- Place Value Through Billions
- Place Value Through Thousandths
- Rounding Whole Numbers
-
Time
18
- Telling time I - hours
- Telling time II - half hours
- Elapsed time I - hours
- Days of the week
- Reading a calendar
- Reading a calendar II
- Using a schedule
- Elapsed time II - hours and half hours
- Months
- Comparing units of time
- Using a schedule II
- Elapsed time III - quarter hours
- Converting minutes and hours II
- Elapsed time IV - 5 minute intervals
- Elapsed time V - minute intervals
- Converting minutes and hours II
- Elapsed time IV - 5 minute intervals
- Elapsed time V - minute intervals
-
Addition
27
- Adding Tens and Ones
- Adding Below Six
- Adding Below Ten
- Adding With Zero
- Addition By Counting
- Doubling
- Doubling Below Twenty
- Basic Associative Property
- Adding Below Twenty
- Adding Three Numbers
- Addition Below Fifty With Carrying
- Addition Below One Hundred
- Missing Addends
- Rewriting Addition as Plus Ten
- Adding Three Numbers
- Two-Digit Addition
- Two-Digit Addition With Carrying
- Adding Tens
- Rounding and Addition
- Adding Three Two-Digit Numbers
- Adding Hundreds
- Adding Hundreds With Carrying
- Addition Review
- Addition and Inequalities
- Properties of Addition
- Addition Up To Ten Thousand
- Adding Money
-
Subtraction
27
- Subtraction Below Five
- Subtraction Below Ten
- Subtraction As Inverse of Addition
- Subtracting Zero or All
- Subtracting By Counting
- Vertical Addition and Subtraction
- Addition and Subtraction Below Fifty
- Subtraction Below Twenty
- Subtraction Below Fifty With Regrouping
- Subtraction Below One Hundred
- Relating Addition and Subtraction
- Place Value and Regrouping
- Subtracting Hundreds
- Subtracting Hundreds With Regrouping
- Subtracting With Regrouping And Zeroes
- Subtraction Review and Vertical Form
- Two-Digit Subtraction
- Two-Digit Subtraction With Regrouping
- Rounding and Subtraction
- Checking Subtraction With Addition
- Subtracting Tens
- Two-Digit Addition and Subtraction Review
- Subtraction Review
- Subtraction Up To Ten Thousand
- Subtracting Money
- Subtract whole numbers
- Subtract across zeroes
- Coins 8
-
Measurement
23
- Introduction to weight
- Customary weight - choose the best unit of measure
- Customary weight - choose the best estimate
- Metric weight - choose the best unit of measure
- Metric weight - choose the best estimate
- Customary distance - choose the best unit of measure
- Customary distance - choose the best estimate
- Metric distance - choose the best estimate
- Metric distance - choose the best unit of measure
- Customary capacity - choose the best estimate
- Metric capacity - choose the best estimate
- Temperature
- Customary weight - choose the best unit of measure
- Customary weight - choose the best estimate
- Metric weight - choose the best unit of measure
- Metric weight - choose the best estimate
- Customary distance - choose the best unit of measure
- Customary distance - choose the best estimate
- Metric distance - choose the best estimate
- Metric distance - choose the best unit of measure
- Customary capacity - choose the best estimate
- Metric capacity - choose the best estimate
- Temperature
Newbie
Rookie
Rock Steady
Comet Club
15 Right
Firefox Friend
1st Grade Number Sense Rockstar
1st Grade Time Rockstar
Easy as Pie
Galactic Gamer
50 Right
Explanation for this problem
Level 1: Subtraction Below Twenty
Pick a monster to be your friend on your math journey!
I'm Toothie!
I'm scary, aren't I?
I'm the most scary monster ever - let's be friends!
I'm scary, aren't I?
I'm the most scary monster ever - let's be friends!
I'm Octo!
I like math. I like boys and girls who like math too!
I like math. I like boys and girls who like math too!
I'm Fuzz!
I give really big hugs! And you can ride me.
I give really big hugs! And you can ride me.
I'm Smiley!
I wish I had a more scary name. All monsters want to be scary.
I wish I had a more scary name. All monsters want to be scary.
I'm Pinky!
I was once told I was "cute". I've been sad ever since. Be my friend and I'll be happy!
I was once told I was "cute". I've been sad ever since. Be my friend and I'll be happy!
Map of Monster World (Level 1)
Monster store: Buy a mission or monster items
You have 500 points
Each mission you complete unlocks new ones!
Your monsters get new powers as they pass missions!
Birthday Cake!
Help your monster friend get cake on their birthday!
Rocket to the moon!
Help your monster go to the moon!
Halloween!
What do monsters dress up as on Halloween?
Unlock clothes as you go! Clothes you buy will appear on your monster!
All body parts are locked. Unlock as you go!
All transportation is locked. Unlock as you go!
Level 1: Subtraction Below Twenty
Birthday Cake - You got Step 1!
Guess what? It's my birthday party tomorrow!
I hear there's something called cake that boys and girls have on their birthday.
Could you bring some? Thank you!
Goal: get 1000 points to earn Step 2
Hint: Mastering new skills and earning badges get you the most points!
Guess what? It's my birthday party tomorrow!
I hear there's something called cake that boys and girls have on their birthday.
Could you bring some? Thank you!
Goal: get 1000 points to earn Step 2
Hint: Mastering new skills and earning badges get you the most points!
Level 1: Subtraction Below Twenty
Birthday Cake - You got Step 1!
Guess what? It's my birthday party tomorrow!
I hear there's something called cake that boys and girls have on their birthday.
Could you bring some? Thank you!
Goal: get 1000 points to earn Step 2
Hint: Mastering new skills and earning badges get you the most points!
Guess what? It's my birthday party tomorrow!
I hear there's something called cake that boys and girls have on their birthday.
Could you bring some? Thank you!
Goal: get 1000 points to earn Step 2
Hint: Mastering new skills and earning badges get you the most points!
Level 1: Subtraction Below Twenty
Birthday Cake - You got Step 1!
Guess what? It's my birthday party tomorrow!
I hear there's something called cake that boys and girls have on their birthday.
Could you bring some? Thank you!
Goal: get 1000 points to earn Step 2
Hint: Mastering new skills and earning badges get you the most points!
Guess what? It's my birthday party tomorrow!
I hear there's something called cake that boys and girls have on their birthday.
Could you bring some? Thank you!
Goal: get 1000 points to earn Step 2
Hint: Mastering new skills and earning badges get you the most points!
Level 1: Subtraction Below Twenty
Birthday Cake - You got Step 1!
Guess what? It's my birthday party tomorrow!
I hear there's something called cake that boys and girls have on their birthday.
Could you bring some? Thank you!
Goal: get 1000 points to earn Step 2
Hint: Mastering new skills and earning badges get you the most points!
Guess what? It's my birthday party tomorrow!
I hear there's something called cake that boys and girls have on their birthday.
Could you bring some? Thank you!
Goal: get 1000 points to earn Step 2
Hint: Mastering new skills and earning badges get you the most points!
Level 1: Subtraction Below Twenty
Birthday Cake - You got Step 1!
Guess what? It's my birthday party tomorrow!
I hear there's something called cake that boys and girls have on their birthday.
Could you bring some? Thank you!
Goal: get 1000 points to earn Step 2
Hint: Mastering new skills and earning badges get you the most points!
Guess what? It's my birthday party tomorrow!
I hear there's something called cake that boys and girls have on their birthday.
Could you bring some? Thank you!
Goal: get 1000 points to earn Step 2
Hint: Mastering new skills and earning badges get you the most points!
Hi, Parent - we're really cute but we're even more powerful!
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Used by over 1 million students in the United States.