Video: Using Models and the Relationship Between Addition and Subtraction to Add within 100

We know that 7 + 3 = 10. What other facts do we know? Find the missing numbers. 10 - 7 = _, 10 - _ = 3.

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Video Transcript

We know that seven plus three equals 10. What other facts do we know? Find the missing numbers.

Starting on the left, we have the number sentence 10 minus seven equals what. If we look at the first set of blocks we were given, we see that the yellow represents three because three plus seven equals 10. So if we have 10 and we take away seven, we will be left with three.

Our second number sentence says 10 minus how many equals three. Again, we can look at the blocks that we started with. We know that there are seven green blocks and that seven plus three equals 10. If we have 10 and take away seven, there will be three remaining. We know that 10 minus seven equals three.

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