Video: Finding One Less Than a Known Double as a Strategy to Add

Notice that 3 is one less than 4. 4 − 1 = 3. So the answer to 4 + 3 is one less than the answer to 4 + 4. If 4 + 4 = 8, which of the following is equal to 4 + 3? [A] 4 + 4 [B] 8 − 1 [C] 4 + 8

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Video Transcript

Notice that three is one less than four. Four take away one equals three. So, the answer to four plus three is one less than the answer to four plus four. If four plus four equals eight, which of the following is equal to four plus three? Four plus four, eight subtract one, or four plus eight.

We know that three is one less than four. And we know that four plus four equals eight. So, four plus three is one less than eight. One less than eight is seven. Which of the following expressions is equal to seven? We know that four plus four is eight. And eight take away one is seven. Four plus eight equals 12. So, the expression which is equal to four plus three is eight subtract one.

We know that three is one less than four. So, the answer to four plus three is one less than the answer to four plus four. If four plus four is equal to eight, the expression which is equal to four plus three is eight subtract one.

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