Video: Understanding That Counting Forwards Represents Addition

On this number line, Jennifer started at 13 and counted forward until she reached 18. Which number sentence describes what Jennifer did? [A] 13 + 5 = 18 [B] 18 − 4 = 14 [C] 13 + 1 = 18 [D] 18 − 5 = 13 [E] 13 + 3 = 18.

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Video Transcript

On this number line, Jennifer started at 13 and counted forward until she reached 18. Which number sentence describes what Jennifer did, 13 plus five equals 18, 18 take away four equals 14, thirteen plus one equals 18, 18 take away five equals 13, 13 add three equals 18?

We know that Jennifer started at 13. So the number sentences which start at 18 don’t describe what Jennifer did. Let’s count the number of times Jennifer counted forward: one, two, three, four, five.

So this is the number sentence which describes what Jennifer did: the answer is 13 plus five equals 18.

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