Video: KS1-M16 • Paper 1 • Question 2

12 − 7 = _.


Video Transcript

12 take away seven equals what?

In this problem, we need to take away or subtract seven from 12. In other words, we need to start with 12 and work out seven less than this. What is seven less than 12? Here are 12 counters. We’ve made a group of 10 and a group of two because 10 plus two make 12. We now need to take seven from our group of 10 and our group of two. What will happen if we take away seven counters from our group of 10?

We know that seven and three go together to make 10. So if we take away seven counters, we should be left with three. Let’s see if we’re right. 10 take away one, two, three, four, five, six, seven. We have three counters left. 10 take away seven equals three.

Remember, we also still have two counters left. So we need to add three and two together to find out how much we have if we take away seven from 12. Three add two equals five. We started with 12 counters; we took away seven counters; we have five counters left.

Let’s check our answer using a number line. Start with 12 and count back seven: 12, 11, 10, nine, eight, seven, six, five. Seven less than 12 is five. If we count back seven from 12, we reach the number five. 12 take away seven equals five.

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