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Question
Find four pairs of numbers, one for each of addition, subtraction, multiplication, and division that make the number 18. Write the equalities for each of them.
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Solution
(9 + 9), (20 − 2), (9 × 2), (36 ÷ 2).
since 9 + 9 = 18, 20 − 2 = 18, 9 × 2 = 18 and 36 ÷ 2 = 18,
so (9 + 9) = (20 − 2) = (9 × 2) = (36 ÷ 2).
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