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Unit: Addition and subtraction

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Possible mastery points

Basic addition and subtraction

Learn
Basic addition
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Basic subtraction
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Practice
Add within 5Get 5 of 7 questions to level up!
Subtract within 5Get 5 of 7 questions to level up!

Addition and subtraction within 20

Learn
Adding 8 + 7
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Subtracting 14 - 6
(Opens a modal)
Practice
Add within 20Get 5 of 7 questions to level up!
Subtract within 20Get 5 of 7 questions to level up!

Strategies for adding and subtracting within 100

Learn
Adding 53+17 by making a group of 10
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Adding by making a group of 10
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Strategies for adding 2-digit numbers
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Addition and subtraction with number lines
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Practice
Add 2-digit numbers by making tensGet 3 of 4 questions to level up!
Add 2-digit numbers by making tens 2Get 3 of 4 questions to level up!
Select strategies for adding within 100Get 3 of 4 questions to level up!
Add within 100 using a number lineGet 3 of 4 questions to level up!

Quiz 1

Level up on the above skills and collect up to 800 Mastery points

Addition within 100

Learn
Adding 2-digit numbers without regrouping
(Opens a modal)
Adding with regrouping
(Opens a modal)
Practice
Add within 100 using place value blocksGet 3 of 4 questions to level up!

Subtraction within 100

Learn
Subtracting 2-digit numbers without regrouping 1
(Opens a modal)
Subtracting with regrouping (borrowing)
(Opens a modal)
Practice
Subtract within 100 using place value blocksGet 3 of 4 questions to level up!

Word problems within 100

Learn
Subtraction word problem: tennis balls
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Addition word problem: horses
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Subtraction word problem: snow
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Subtraction word problem: crayons
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Practice
Addition word problems within 100Get 3 of 4 questions to level up!
Subtraction word problems within 100Get 3 of 4 questions to level up!

Quiz 2

Level up on the above skills and collect up to 400 Mastery points

Multi-digit addition with regrouping

Learn
Using place value to add 3-digit numbers: part 2
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Adding 3-digit numbers
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Relate place value to standard algorithm for multi-digit addition
(Opens a modal)
Adding multi-digit numbers: 48,029+233,930
(Opens a modal)
Three digit addition word problems
(Opens a modal)
Practice
Select strategies for adding within 1000Get 3 of 4 questions to level up!
Add within 1000Get 3 of 4 questions to level up!
Multi-digit additionGet 3 of 4 questions to level up!

Multi-digit subtraction with regrouping

Learn
Methods for subtracting 3-digit numbers
(Opens a modal)
Relate place value to standard algorithm for multi-digit subtraction
(Opens a modal)
Worked example: Subtracting 3-digit numbers (regrouping)
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Worked example: Subtracting 3-digit numbers (regrouping twice)
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Worked example: Subtracting 3-digit numbers (regrouping from 0)
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Subtracting in your head (no regrouping)
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Multi-digit subtraction: 389,002-76,151
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Subtraction by breaking apart
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Missing number for 3-digit subtraction within 1000
(Opens a modal)
Three digit subtraction word problems
(Opens a modal)
Practice
Select strategies for subtracting within 1000Get 3 of 4 questions to level up!
Subtract on a number lineGet 3 of 4 questions to level up!
Subtract within 1000Get 3 of 4 questions to level up!
Multi-digit subtractionGet 3 of 4 questions to level up!
Break apart 3-digit subtraction problemsGet 3 of 4 questions to level up!

Quiz 3

Level up on the above skills and collect up to 800 Mastery points
Up next for you:

Unit test

Level up on all the skills in this unit and collect up to 2000 Mastery points!

About this unit

In this topic, we will add and subtract whole numbers. The topic starts with 1+1=2 and goes through adding and subtracting within 1000. We will cover regrouping, borrowing, and word problems.