Video: KS1-M18 • Paper 2 • Question 32

Write two numbers that are greater than 20 to make this subtraction correct. _ − _ = 2

02:48

Video Transcript

Write two numbers that are greater than 20 to make this subtraction correct. What take away what equals two?

We know the answer to the subtraction is two. This means that the two numbers in our subtraction sentence must have a difference of two. For example, four take away two equals two. The difference between four and two is two. But we’re looking for two numbers that are greater than 20. 21 is greater than 20, and 19 is two less than 21. The difference between 21 and 19 is two. So 21 take away 19 equals two.

We may think that we’ve found the answer, but let’s check. Is 19 greater than 20? No it’s not. What if we add one to each of the numbers in the boxes? Add one to 21; we have 22. And if we add one to 19, we have 20. 22 take away 20 is two. But 20 is not greater than 20. It’s equal to 20.

So we need to add one to each of our numbers again. So we can change our 22 to 23, and we can change our 20 to 21. 23 and 21 have a difference of two. And both numbers are greater than 20. 23 take away 21 equals two.

There are many possible answers to this question. We could write any two numbers that are greater than 23 and 21 to make the sentence correct. The first number could be 75; the second could be 73, as long as the difference between the two numbers is two and both numbers are greater than 20. The numbers we chose were 23 and 21 because 23 take away 21 equals two.

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