Fifth grade math/compatible numbers divison?

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Oddman answered
Compatible numbers are nearby numbers that make the problem easier. Example   95/73 can be approximated by 100/75 = 1 1/3.   100 is near 95, and 75 is near 73. 100 and 75 are compatible numbers in this problem.   (95/73 is about 1.3014, a little smaller than our estimate of 1.3333)

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