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Unit: Addition, subtraction, and estimation
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About this unit
The world of math is full of twists and turns but luckily, this unit on addition, subtraction, and estimation is here to help you navigate. Whether it's mastering the art of rounding or learning how to regroup, Khan Academy is your secret weapon for success.Learn
Practice
- Round to nearest 10 or 100 on the number lineGet 5 of 7 questions to level up!
- Round to nearest 10 or 100Get 3 of 4 questions to level up!
- Round to nearest 10 or 100 challengeGet 3 of 4 questions to level up!
Practice
- Estimate to add multi-digit whole numbersGet 3 of 4 questions to level up!
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!
- Select strategies for adding within 1000Get 3 of 4 questions to level up!
Practice
- Estimate to subtract multi-digit whole numbersGet 3 of 4 questions to level up!
Learn
Practice
- Break apart 3-digit subtraction problemsGet 3 of 4 questions to level up!
- Subtract on a number lineGet 3 of 4 questions to level up!
- Select strategies for subtracting within 1000Get 3 of 4 questions to level up!
Learn
Practice
- Subtract within 1000Get 3 of 4 questions to level up!
Up next for you:
Level up on all the skills in this unit and collect up to 1600 Mastery points!