James used 12 ounces of flour to
make the dough for three pizzas. How many ounces of flour are needed
to make one pizza?
Let’s identify the key information
as we try to work out what the problem is asking us. So James is making pizzas. And he finds that if he uses 12
ounces of flour, he’s able to make three pizzas. And the question asks us to find
the amount of flour that James will need if he only wants to make one pizza
Let’s sketch a bar model to help us
see how to find the answer. There’s our one bar and it
represents the 12 ounces of flour that James has used. And by splitting it into three,
this represent the three pizzas that James makes. So the question is really asking us
to identify the value of one of our bars. How many ounces of flour needed to
make one pizza?
To find the answer, we need to
split 12 ounces into three equal parts or divide. This is a division question. If we split the number 12 into
three equal groups, how many will be in each group?
Here are three groups. Let’s split 12 equally between
them: one, two, three, four, five, six, seven, eight, nine, 10, 11, 12. Therefore, in each group, 12
divided by three equals four. And so we can use this information
to relabel our bar model. And we can see the answer to the
problem: James will need four ounces of flour to make one pizza.