Video: Subtracting From 8 and 9

In this video, we will learn how to use pictures and subtraction equations to show all the ways to take away from the numbers 8 and 9.

07:33

Video Transcript

Subtracting from Eight and Nine

In this video, we will learn how to use pictures and subtraction sentences to find all the ways to take away from the numbers eight and nine. Here’s a picture of eight cars in a ten frame. If we take one car away, there will be seven cars left. We could write this as a subtraction sentence. Eight subtract one equals seven. Eight subtract two equals six. Eight subtract three equals five. Eight take away four equals four. Eight take away five equals three. Eight subtract six equals two. Eight subtract seven equals one. And if we subtract all eight cars, there will be no cars left.

Let’s look closely at the subtraction sentences. What do you notice? Did you notice that each subtraction sentence begins with the number eight? This is because this is the number of cars we had to start with. This column shows the number of cars we took away each time. What do you notice about these numbers? One, two, three, four, five, six, seven, eight. These numbers increase by one each time. We’re adding one each time. What do you notice about the numbers in the third column? These are the number of cars that are left. Seven, six, five, four, three, two, one, zero. These numbers are decreasing by one each time; we’re taking one away each time.

We’re going to use these patterns in subtraction sentences and pictures to help us find all the ways to take away from the numbers eight and nine.

Ethan is subtracting from eight. Write the missing sentence. Eight take away one equals seven. Eight take away two equals six. Eight take away three equals five. Eight take away four equals four. What? Eight take away six equals two. Eight take away seven equals one.

In this question, we need to find the missing subtraction sentence. We can use the pictures or the number sentences to help us find the answer. We know that the number at the start of our number sentence is the number eight because all of the other subtraction sentences start with the number eight. And if we look at all of the pictures of ten frames, we can see that they all contain eight counters. We can write the subtract symbol after the number eight because all of these number sentences are subtraction sentences. But we don’t know how many to subtract. Let’s use the number sentences to help us.

Let’s look closely at what happens to the number that we’re subtracting each time. One, two, three, four, five. We can use the picture to check if we are taking away five. One, two, three, four, five. Now, what we need to do is work out how many counters are left. What is eight subtract five? Let’s use the number sentences again to help. Seven, six, five, four, three. Seven, six, five, four, three. Let’s check the picture to see if there are three counters left. One, two, three. Yes, there are. Eight take away five equals three. The missing subtraction sentence is eight take away five equals three. We use the pictures and the subtraction sentences to help us find the answer.

Victoria is subtracting from nine. Write the missing sentence. Nine take away one equals eight. Nine take away two equals seven. Nine take away three equals six. What? Nine take away five equals four. Nine take away six equals three. Nine take away seven equals two. And nine take away eight equals one.

In this question, we need to write the subtraction sentence which matches this picture. We know our subtraction sentence begins with the number nine because all of the subtraction sentences begin with the number nine because there are nine counters in the ten frame to start with. We also know that this is a subtraction sentence, but we don’t know how many we need to subtract. Let’s use the picture to help us. We’re subtracting one, two, three, four.

We can also use the subtraction sentences to help. The number that we subtract each time increases by one. One, two, three, four. Now, all we need to do to complete our number sentence is write the number of counters that are left. We could use the subtraction sentences to help again. We’re taking away one more each time. The numbers are going down by one each time. Eight, seven, six, five. Nine subtract four equals five. We found the missing sentence. We use the pictures and the subtraction sentences to help.

What have we learned in this video? We’ve learned how to use pictures and subtraction sentences to find ways to take away from the numbers eight and nine.

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