Answer:
8
Explanation:
write out the equation.
5 x ? = 40
since this is a simple question you can usually already tell but if these were bigger numbers you can plug it into an equation like this.
40/5 = ?
and of course, 40/5 will grant you 8. So the number is 8.
Check:
5 x 8 = 40
40 = 40
Hope I could help :)))