Michael bought nine eggs. He used five of them to make cakes. How many eggs are there now?
We’re given a word problem involving eggs. We know that Michael had nine eggs. And he used five of them to make cakes. We have to work out how many eggs he has now. How are we going to do this? Is this an addition or a subtraction problem?
We can sketch a bar model to help us think about how to solve the problem. Michael had nine eggs. He used five of them. How many are left? We can see that this is a subtraction. We have to take away the five eggs that Michael used. To help us calculate how many eggs Michael has left, we can use a number line. We need to start at number nine and count back five. One, two, three, four, five. Nine take away five equals four.
If Michael buys nine eggs and uses five of them to make cakes, he will have four eggs left. Nine take away five equals four.