2nd grade mental math strategies worksheets

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Mental math strategies worksheets for 2nd grade print 4 problems per page. Choose why each strategy works. Complete its equation. Show how your number steps keep the same total or difference.

Free printable PDF worksheet, aligned to Common Core 2.NBT.B.9.

Each print is a different sheet with its own answer key. You don't need to sign up.

The kind of problems you'll get

Choose why each strategy works. Complete its equation.

  1. A student solves 41 + 12 by splitting each addend into tens and ones. (40 + 10) + (1 + 2) =

    Answer: Break apart both numbers. Add tens to tens and ones to ones.

  2. A student moves 2 from 27 to 38 before adding. 40 + 25 =

    Answer: Move 2 from 27 to 38. The total stays the same.

  3. A student solves 53 − 23 by subtracting tens from tens and ones from ones. (50 − 20) + (3 − 3) =

    Answer: Break apart both numbers. Subtract tens from tens and ones from ones.

Every print pulls a fresh set of problems at this level, so a make-up test or a second sibling never gets the same sheet.

What's on each sheet

Every version prints on US Letter or A4, with its answer key after the problems.

This sheet is one of the versions on the 2nd grade mental math page, with its own difficulty choices and its own answer key.

How to teach this

Ask "what's the friendly number nearby?" before your child computes. 29 wants to be 30, 41 wants to be 40. Have them say the strategy out loud: "add 30, take 1 back." When an explanation is requested, have your child connect each adjustment to the original numbers with words or an equation.

Watch for: Kids set up column arithmetic on paper. This page is head math, so talk through a friendly-number shortcut instead. Kids adjust the wrong way after rounding. If you added 1 to turn 29 into 30, take 1 back off the answer.

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Aligned to Common Core 2.NBT.B.9. Reviewed by the One more sheet team. Content version 241, updated October 2026.

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