Annie is working on the multiplication problem 19 x 21. She says that 19 x 21 should equal 20 x 20 because 19 is one less than 20 and 21 is one more than 20. This is a wonderful idea, but is Annie correct?

Annie is working on the multiplication problem 19 x 21. She says that 19 x 21 should equal 20 x 20 because 19 is one less than 20 and 21 is one more than 20. This is a wonderful idea, but is Annie correct?

Elementary Geometry For College Students, 7e

7th Edition

ISBN:9781337614085

Author:Alexander, Daniel C.; Koeberlein, Geralyn M.

Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.

ChapterP: Preliminary Concepts

SectionP.CT: Test

Problem 1CT

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Annie is working on the multiplication problem 19 x 21. She says that 19 x 21 should equal
20 x 20 because 19 is one less than 20 and 21 is one more than 20. This is a wonderful idea, but is Annie correct?

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