AlgebraEasyWorking backwards from a giveaway
Algebra practice question
Ben had some marbles. After giving 4 of them away, he had 9 left. How many marbles did Ben have to start with?
Answer: 13
m − 4 = 9, so m = 13.
Common wrong answers
- If you answered 5
- 5 is 9 − 4, subtracting again instead of adding back.
- If you answered 9
- 9 is what was left.
- If you answered 36
- 36 is 9 × 4.
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