Which calculation has an odd number as an answer?
A 177 + 99 B 300 + 106 C 6 ÷ 3 D 103 X 9 E 1033 – 85
D
Each calculation could be done separately and the answers looked at to see which one was odd. But better, and quicker, is to use number facts to find the last digit of each calculation. In A, 7 + 9 = 16, even; in B, 0 + 6 = 6, even; in C, 6 ÷ 3 = 2, even; in D 3 X 9 = 27, odd; in E 33 – 5 = 28, even. So the answer is D.
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