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?
Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter9: Systems Of Linear Equations
Section9.7: Puzzle Problems
Problem 10P
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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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