Balance equivalent number sentences
Find the missing number that makes two addition or subtraction expressions equivalent, up to 50. Unlimited questions, five difficulty levels, and a full worked solution every time — free.
Try one
Find the missing number that makes both sides equal.
8 - 7 = 13 - ___
Answer: 12
See one solved, step by step
Find the missing number that makes both sides equal.
5 + 6 = 2 + ___
📘 Worked solution
15 + 6 = 11Find the total on the left side first.
22 + ___ = 11, so ___ = 11 - 2 = 9Both sides must equal 11, so subtract 2 from 11.
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