Video: Composing Teen Numbers Using Equations

If 19 = 10 + 9, how is 18 composed? [A] 18 = 1 + 8 [B] 18 = 10 + 8 [C] 18 = 10 + 18.

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Video Transcript

If 19 equals 10 plus nine, how is 18 composed? 18 equals one plus eight, 18 equals 10 plus eight, 18 equals 10 plus 18.

So we need to choose which answer is a way of composing or making 18. We could use tens and ones bricks to help. We can make 18 using a 10 and eight ones. Our model shows that 18 is equal to 10 plus eight. This is the correct answer.

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