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.
