Question

(i) Find the factors of 84.
(ii) How many factors of 84 are odd?

Answer 1

We can write 84 as,
$84=1\times 84$
$84=2\times 42$
$84=3\times 28$
$84=4\times 21$
$84=6\times 14$
$84=7\times 12$
Thus, all the factors of 84 are 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42 and 84.
(ii) The odd factors are 1, 3, 7 and 21
Hence, 4 factors are odd.