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Unit 1: Addition and subtraction
700 possible mastery points
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About this unit
Learn how to add and subtract three-digit numbers by thinking about ones, tens, and hundreds.
Learn
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 on a number lineGet 3 of 4 questions to level up!
- Estimate to add multi-digit whole numbersGet 3 of 4 questions to level up!
Learn
Practice
- Subtract within 1000Get 3 of 4 questions to level up!
Practice
- Find the missing number (add and subtract within 1000)Get 3 of 4 questions to level up!
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Level up on all the skills in this unit and collect up to 700 Mastery points!