Video: KS1-M17 • Paper 1 • Question 12

97 + 5 = _.

02:17

Video Transcript

97 plus five equals what.

In this question, we’re asked to add a single-digit number, the number five, to a two-digit number, the number 97. What is five more than 97? Because five is such a small number, one way to find the answer might be just to count on five. Start with 97. And then count in ones five more times, 97, 98, 99, 100, 101, 102. Five more than 97 is 102.

One way we could find the answer more quickly is to use what we know about the number five to help. Well, five is the same as three plus two. So we could add three and then two. Why would this be useful? Well, let’s look at the number we’re adding on to. We’re starting with the number 97. And we know that seven combines with three to make the next ten. So 97 must be only three away from 100. This means that if we split the number five into three and two, we can add three to 97 really quickly. 97 plus three takes us to 100.

Now, we just need to add the two. And because we’re adding it to 100, again this is really quick to do. 100 plus two is going to be 102. And so although we could count on five more than 97, we could also partition or break down the number five into three and two. 97 plus three equals 100. And then, all we have to do is to add the two to get to 102.

97 plus five equals 102.

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