Addition and subtraction

Strategies for adding two and three-digit numbers

Learn

Breaking apart 3-digit addition problems
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Addition using groups of 10 and 100
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Adding and subtracting on number line
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Estimating adding and subtracting 3-digit numbers
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Practice

Break apart 3-digit addition problemsGet 3 of 4 questions to level up!
Add using groups of 10 and 100Get 3 of 4 questions to level up!
Add and subtract on a number lineGet 3 of 4 questions to level up!
Estimate to add and subtract multi-digit whole numbersGet 5 of 7 questions to level up!

Adding with regrouping within 1000

Learn

Using place value to add 3-digit numbers: part 1
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Using place value to add 3-digit numbers: part 2
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Adding 3-digit numbers
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Practice

Add within 1000Get 3 of 4 questions to level up!

Subtracting with regrouping within 1000

Learn

Worked example: Subtracting 3-digit numbers (regrouping)
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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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Practice

Subtract within 1000Get 3 of 4 questions to level up!

Addition and subtraction missing value problems

Learn

Missing number for addition and subtraction within 1000
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Practice

Find the missing number (add and subtract within 1000)Get 3 of 4 questions to level up!

About this unit

Learn how to add and subtract three-digit numbers by thinking about ones, tens, and hundreds.