Question Video: Counting the Number of Objects and Writing the Number in Digits Mathematics • 1st Grade

Scarlett added 9 and 7 by making ten. What number is missing from her solution? 9 + 7 = 16, 10 + _ = 16.

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Video Transcript

Scarlett added nine and seven by making 10. What number is missing from her solution? Nine plus seven equals 16. 10 plus what equals 16.

To understand what Scarlett’s done here, we could try to answer the question ourselves. And we’re going to try to make the addition, nine plus seven, a little easier to work out by making 10. Here’s what nine plus seven might look like using two ten frames. And one way to find the answer, we could start with the number nine and then count on seven more. But you know, adding a number to the number 10 is always a quick way to find the total. So what we can do to help ourselves is to turn the number nine into 10.

What goes with nine to make 10? Well, we know nine plus one more makes 10. To find the extra one that we need, we’re going to split our number seven up into one and whatever is left. And we know that one and six make seven. We can show this using our ten frames by moving across one counter. Now, we’ve made 10 in the first ten frame. We just need to add the six counters in the second ten frame. We’ve turned our calculation nine plus seven into 10 plus six. 10 plus six is 16. And so we know that nine plus seven must be 16 too. Scarlett added nine and seven by making 10. The number that’s missing from her solution is the number six. 10 plus six equals 16.

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