Video: Finding All Ways to Subtract from 8

Ethan is subtracting from 8. Write the missing sentence. 8 − 1 = 7. 8 − 2 = 6. 8 − 3 = 5. 8 − 4 = 4. _ 8 − 6 = 2. 8 − 7 = 1.

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Video Transcript

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.

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