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Simplification & Approximation · Question 15 of 71

Question 15

MediumOriginal question

Find the missing number: □×12−96÷8=84\square \times 12 - 96 \div 8 = 84.

Options for question 15

Show the answer and explanation
CorrectNot quiteAnswer C

Correct answer: C

Explanation

  1. First simplify the known part: 96÷8=1296 \div 8 = 12.

  2. So □×12−12=84\square \times 12 - 12 = 84, which gives □×12=96\square \times 12 = 96.

  3. Hence □=96÷12=8\square = 96 \div 12 = 8.

Worth noting

Subtracting 12 instead of adding it back gives 72÷12=672 \div 12 = 6. To undo a subtraction you add.

Concept
Undoing operations to find a missing number
Typical time
60 s
Your time
—
The rule this testsOrder of operations (BODMAS)
Practise this chapter →

Ten questions from Simplification & Approximation, at your own pace.

Practise this chapter →

Ten questions from Simplification & Approximation, at your own pace.