Ben has seven bags of grapes. Each bag has 10 grapes. Ben gives 25 grapes to his friends. How many grapes does he have left?
This question has two parts. First, we need to work out how many grapes Ben has to begin with. Then we need to calculate how many grapes he will have left after he gives 25 grapes to his friends. Let’s answer the first step of the problem. We know that Ben has seven bags. Each bag has 10 grapes. We need to calculate seven lots of 10 or seven times 10. And we know that seven times 10 is 70. We can count in tens on our number line to check: 10, 20, 30, 40, 50, 60, 70. Seven lots of 10 makes 70. So we know that Ben has 70 grapes to begin with.
Now we need to calculate the second step of the problem. Ben had 70 grapes to begin with. And he gave 25 to his friends. So we need to calculate 70 take away 25. To help us calculate the answer, we could break 25 apart into a 20 and a five. 70 take away 20 is 50, and 50 take away five takes us to 45. 45 is halfway between 40 and 50. Ben had 70 grapes to begin with. He gave 25 grapes to friends. He has 45 grapes left.