From the statement we know that:
1 dime = 10 pennies
Q) We want to know how many pennies make four dimes.
A) We simply multiply each side of the equation above by 4, we get:
4 x 1 dime = 4 x 10 pennies
4 dimes = 40 pennies
So we find that 40 pennies make 4 dimes and we can complete the boxes in the following way:
