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



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