Question

the smallest number, greater than 0, which is a multiple of both 40 and 50

Answer 1

Hey mate here is your answer

Answer 2

$40 = 2 \times 2 \times 2 \times 5 \\ 50 = 2 \times 5 \times 5$

$\large \mathcal \color{purple}{multiple~of~40~and~50}$$\large \tt \color{yellow}{=2×5 =10}$