Benjamin tipped a tub of balls on the floor. Three were left in the tub. Which number should Benjamin start counting from to find out how many balls there were altogether? How many balls were there altogether?
We know there were three balls left in the tub. We need to work out how many balls Benjamin tipped out of the tub onto the floor. We could count these balls in twos, two, four, six, eight, 10. So the number that Benjamin should start counting from to find out how many balls there are altogether is 10.
We know that three balls were left in the tub. So if we start counting at number 10, we need to count forward three more times because there are 10 balls on the floor and three more in the bucket, 10, 11, 12, 13. 10 and three more is 13.
So there were 13 balls altogether.