Question

Some numbers are given below.

$28,30,36,45,56,66,81,120,121,156$

Which of the given numbers can be shown as Squares.

Answer 1

From the given numbers,

$$\begin{gathered} 28=7\times 4 \\ 30=6\times 5 \\ 36=6\times 6 \\ 45=9\times 5 \\ 56=8\times 7 \\ 66=11\times 6 \\ 81=9\times 9 \\ 120=5\times 4\times 3\times 2 \\ 121=11\times 11 \\ 156=2\times 2\times 3\times 13 \end{gathered}$$

Hence, $36,81,121$can be written as squares.