Two-Digit Addition & Subtraction with Mental Math
Online practice for grades 1-3

Here you can practice adding and subtracting two-digit numbers using mental math (such as 78 + 6, 40 + 15, 54 + 22, 29 + 37, 59 − 4, 100 − 28, etc.).

Here are some grade-level suggestions:

First graders should practice — and MASTER — adding a two-digit number and a single-digit number without regrouping (e.g. 24 + 5, 67 + 2), AND adding/subtracting two-digit numbers and multiples of ten (e.g. 45 + 30, 67 − 50).
For second grade, I suggest practicing adding a two-digit number and a single-digit number with regrouping (e.g. 47 + 8, 77 + 5), and similarly, subtracting a two digit number and a single-digit number with regrouping (e.g. 82 − 4, 64 − 8). Second graders should also add and subtract two-digit numbers without regrouping, and subtract a two-digit number from 100. They can also try adding and subtracting two-digit numbers with regrouping.
Finally, children in third grade can practice with all the options listed below. 🙂

Screenshot:
Screenshot of someone doing a round

2-digit + 1-digit, no regrouping (e.g. 45 + 3, 62 + 7)

2-digit + 1-digit, with regrouping (e.g. 45 + 8, 62 + 9)

2-digit + multiple of 10 (e.g. 40 + 23, 55 + 30)

multiple of 10 + multiple of 10 (e.g. 40 + 20, 90 + 50)

2-digit + 2-digit, no regrouping (e.g. 25 + 13, 61 + 38)

2-digit + 2-digit, with regrouping (e.g. 54 + 27, 38 + 28)

2-digit − 1-digit, no regrouping (e.g. 45 − 3, 68 − 5)

2-digit − 1-digit, with regrouping (e.g. 45 − 8, 63 − 5)

2-digit − multiple of 10 (e.g. 37 − 20, 97 − 50)

multiple of 10 − multiple of 10 (e.g. 40 − 20, 90 − 50)

2-digit − 2-digit, no regrouping (e.g. 76 − 22, 57 − 35)

2-digit − 2-digit, with regrouping (e.g. 55 − 36, 92 − 37)

100 − 2-digit (e.g. 100 − 33, 100 − 58)

Timed practice ( sec per answer)

Not timed

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Correct: 0 Wrong: 0

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