Video: Subtract to Compare

In this video, we will learn how to find the difference between two numbers and say how much more or less one number is than another.

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Video Transcript

Subtract to Compare

In this video, we will learn how to find the difference between two numbers and say how much more or less one number is than the other. This is a monster choir. This is the back row, and this is the front row. Let’s compare the number of singers on the back row and the front row. Let’s find the difference.

To find the difference, we need to count the number of singers on the back row and the number of singers on the front row. On the back row, there are one, two, three, four, five, six monsters. On the front row, there are one, two, three monsters. So, we need to find the difference between six and three. We could use counters to compare the numbers six and three. These six counters represent the six monsters on the back row. And the three green counters represent the three monsters on the front row. Six is more than three, so we can say that there are more singers on the back row. Or, there are less singers on the front row.

How many more singers are there on the back row? We could subtract to compare. If we match our counters, we can see that there are three more counters on the back row. There are three counters left over. There are three more singers on the back row than the front, and three less singers on the front row than the back row. Let’s practice subtracting to compare with some example questions.

There are nine rabbits and four carrots. Subtract to find the difference. Nine subtract four equals what? There are what rabbits than carrots.

We know there are nine rabbits and four carrots. And we know we have to subtract to find the difference. We have to find the difference between nine and four. Here are nine counters to represent the nine rabbits and four counters to represent the four carrots. Let’s match our four carrots with four rabbits.

We can call the counters that are left over “the difference”. There are more rabbits than carrots, but how many more? Let’s count. One, two, three, four, five. There are five more rabbits than carrots. The difference between nine and four is five. Nine subtract four equals five. There are five more rabbits than carrots.

There are nine frogs and six elephants. After subtracting to find the difference, there are what frogs than elephants.

In this question, we’re being asked to compare the number of frogs and the number of elephants. We know there are nine frogs and six elephants, so we have to find the difference between nine and six. We have to subtract six from nine. Here are nine squares to represent our nine frogs and six squares to represent the six elephants. If we match each of the squares, we can see there are three green squares left over. The difference between nine and six is three. There are three more frogs than elephants.

What have we learned in this video? We’ve learned how to subtract to compare two numbers and how to find the difference between two groups.

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