Algebra practice question

Answer: 2.5 or 5/2

Let the number be x: 4x − 1 = 9. Add 1: 4x = 10. Divide by 4: x = 2.5.

Common wrong answers

If you answered 2

2 comes from 4x = 8, subtracting the 1 instead of adding it back.

If you answered 10

10 is 4x, one step from the answer. Divide by 4.

If you answered 40

40 is 10 × 4, multiplying instead of dividing.

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