Mathematics
Here are two different factor trees of the number 90. Write the missing numbers:
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Answer
(i) In the first factor tree, 90 = 10 × 9.
10 = 2 × ?, so the missing number is 5 (since 10 = 2 × 5).
9 = ? × 3, so the missing number is 3 (since 9 = 3 × 3).
(ii) In the second factor tree, 90 = 45 × ?, so the missing number is 2 (since 90 = 45 × 2).
45 = 15 × ?, so the missing number is 3 (since 45 = 15 × 3).
15 = ? × ?, so the missing numbers are 3 and 5 (since 15 = 3 × 5).
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