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 Rectangles.

Answer 1

From the given numbers,

$28=7\times 4$

$30=6\times 5$

$36=12\times 3$

$45=9\times 5$

$56=7\times 6$

$66=11\times 6$

$81=27\times 3$

$120=40\times 30$

$156=52\times 3$

Hence, $28,30,36,45,56,66,81,120,156$ can be written as rectangular numbers.