Video Transcript
Writing Multiplication
Sentences
In this video, we will learn how to
write multiplication sentences to match models.
Let’s think about how to write this
model as a multiplication sentence. Here’s a multiplication
sentence. We need to think about the missing
numbers. Let’s think about what the picture
shows. There are three groups, three
groups of carrots. How many carrots are there in each
group? There are three. There are three groups of carrots,
and each group contains three carrots.
We can use our model to help us
write our multiplication sentence. The first number is the number of
groups we have. We have three groups of
carrots. And our second number tells us how
many there are in each group. Again, there are three carrots in
each group. Three times three or three
multiplied by three. What’s the total? What is three multiplied by
three? Let’s count in threes to help us
find the answer. Three, six, nine. Three multiplied by three is
nine.
What multiplication sentence could
we write to match this model?
Our first number is the number of
groups we have. So, let’s count them. There’s one, two, three, four, five
groups. So, we can write our first number
in our multiplication sentence, five multiplied by what. The second number is the number of
counters in each group. Each group contains two
counters. So, our multiplication sentence, so
far, is five multiplied by two. Now, what we need to do is work out
the total number of counters.
What is five multiplied by two? To work out the answer, we could
count in twos five times. Two, four, six, eight, 10. The total number of counters is
10. Five multiplied by two equals
10.
Let’s practice writing some
multiplication sentences.
Use the picture to find all the
missing numbers. There are what groups. There are what cars in each
group. There are four times two equals
what cars in total.
This is a three-part question. We have to find all three missing
numbers. And we’re told to use the picture
to help. In the first part of the question,
we have to work out how many groups there are. In other words, how many groups of
cars can you see? Let’s count them. Here’s one group, two, three,
four. There are four groups of cars.
Next, we need to count the number
of cars in each group. Let’s use some counters to
help. This group has one, two cars. There are two cars in each
group. There are four groups of two
cars. So, our multiplication sentence is
four times two.
Now, what we need to do is work out
the total number of cars. Let’s count in twos. Two, four, six, eight. Four times two is eight. There are four groups. There are two cars in each
group. There are four times two equals
eight cars in total.
Use the model to find all the
missing numbers. What groups of four is 20. Five times what equals 20.
We’re shown a model, which we have
to use to find the missing numbers. In the first part of the question,
we need to work out how many groups of four make 20. Let’s count how many groups there
are. There’s one, two, three, four, five
groups. Five groups of four is 20. Did you notice that both of the
multiplication sentences now begin with the number five? So, we know the number of groups is
five.
Do we know how many counters there
are in each group? Yes, we do, five groups of
four. And we can count the number of
counters in each group to check. Five times four equals 20. One group of four is four, two
groups of four are eight, three groups of four are 12, four groups of four are 16,
and five groups of four are 20. Five groups of four is 20. Five times four equals 20. The missing numbers are five and
four.
Which equation describes the number
of dots in this model? 15 divided by three equals
five. Three times five equals 15. Five plus three equals 15. Or 15 divided by five equals
three.
We have to choose which of these
four equations describes the number of dots in the model. How many groups of dots are
there? Let’s count. One, two, three. How many dots are there in each
group? Did you count? There are five dots in each
group. What is three groups of five? To work out how many dots there are
in total, we could count in fives. Five, 10, 15. Three groups of five is 15.
Which number sentence says that
there are three groups of five dots which equals 15? It can’t be the first sentence. It doesn’t say three groups of
five. Let’s look at the second
sentence. Three times five equals 15. Three groups of five dots equals
15. This equation describes the number
of dots in the model. Five plus three doesn’t equal
15. It equals eight. We know there are 15 dots in this
model. And this sentence is a division
sentence. We were looking for a
multiplication sentence. Three multiplied by five equals
15.
Gummy bears come in packets of
10. Natalie has three packets of gummy
bears. Write a number sentence that shows
how many gummy bears she has.
Let’s think about the information
we already have. We know that gummy bears come in
packets of 10. So, we have groups of 10. And we know that Natalie has three
packets of gummy bears. Let’s try and write a number
sentence which shows this. We need to write a multiplication
sentence. This number tells us the number of
packets that Natalie has. How many packets of gummy bears
does she have? That’s right. There are three. And we already know that there are
10 gummy bears in each packet. Natalie has three groups of 10
gummy bears.
How many gummy bears does she have
in total? We could count in 10s to find the
answer. Three lots of 10. One group of 10 or one packet of 10
is 10. Two packets of 10 is 20. And three times 10 is 30. 10, 20, 30. We counted in 10s three times. Three times 10 equals 30. The number sentence that shows how
many gummy bears Natalie has is three times 10 equals 30.
What have we learned in this
video? We’ve learned how to write
multiplication sentences to match models.
