Question

how many square cards of side 45cm can be cut of a square cardbord sheet of side 315cm ?

Answer 1

area of square cards=
$45 \times 45 \\ = 2025 {cm}^{2}$
now,
area of square cardboard=
$315 \times 315 \\ = 99225 {cm}^{2}$
no of card that can be cut out from square cardboard=
$99225 \div 2025 \\ = 49$