Video: Testing the Strategy: Making 10

Fill in the blank: 7 + 9 = 10 + _.

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Video Transcript

Fill in the blank: seven plus nine equals 10 plus the missing number.

The question asks us to find seven plus nine. Nine plus seven is the same as seven plus nine. So if we start with nine bricks and add seven, that will help us find the missing number. Add one, two, three, four, five, six, seven. We had to find the number sentence equal to seven plus nine. So we turned the numbers around and found nine plus seven. Now we have a ten frame and six ones. Seven plus nine is equal to 10 plus six.

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