Mental math worksheets
Each print is a different sheet with its own answer key. You don't need to sign up.
Turn hard numbers into friendly ones: to add 29, add 30 and then take 1 back.
Two grades, each its own sheet. Print one here, or open a grade for examples and teaching notes.
Print by grade
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2nd grade
Mental math worksheets for 2nd grade practice adding and subtracting two-digit numbers in your head with friendly-number strategies: add 30 instead of 29, then adjust. Some worksheets ask students to choose a place-value or compensation strategy and explain why it works.
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3rd grade Core grade
Each print is a different sheet with its own answer key. You don't need to sign up.
In 3rd grade, mental math stretches to three-digit numbers with the same strategies: make a hundred, add a friendly number and compensate, subtract in easy chunks. The sheets stay horizontal because the goal is flexible thinking, not the written algorithm.
More on multi-digit addition & subtraction
All addition & subtraction worksheets →
Or all math worksheets: every grade, every topic.