Video: Solving Addition Problems Which Are One More Than a Known Sum

Use 4 + 4 = 8 to find 4 + 5.

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Video Transcript

Use four plus four equals eight to find four plus five.

If four plus four equals eight and five is one more than four, we can say that four plus five is the same as four plus four plus one, which makes nine.

The answer is nine because four plus five is one more than four plus four.

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