Complete: the missing number multiplied by five equals 45.
The question asks us which number multiplied by five makes 45. We could solve this calculation by asking how many fives are there in 45. This will give us the missing number. To find out how many fives there are in 45, we could skip-count in fives: five, 10, 15, 20, 25, 30, 35, 40, 45.
How many times did we count in fives? One, two, three, four, five, six, seven, eight, nine. 45 divided by five is nine. And nine multiplied by five equals 45. So the missing number we need to complete the equation is nine.