Balanced equations and equations with symbols
Determine whether addition, subtraction, and multiplication expressions are equivalent, and solve one-step equations that use a letter to represent an unknown number. Unlimited questions, five difficulty levels, and a full worked solution every time — free.
Try one
Find the missing number that makes both sides equal.
60 - 39 = 344 - ___
Answer: 323
See one solved, step by step
Find the missing number that makes both sides equal.
616 + 12 = 122 + ___
📘 Worked solution
1616 + 12 = 628Find the total on the left side first.
2122 + ___ = 628, so ___ = 628 - 122Both sides must equal 628, so subtract 122 from 628.
3___ = 506That's the missing number.
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