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10 December, 20:36

what might you consider when deciding whether to use rounding or compatible numbers to estimate? explain

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  1. 10 December, 22:11
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    We need to choose the nearest possible rounded off numbers for the estimation.

    Step-by-step explanation:

    Compatible numbers are the pairs of numbers which are easy to add, subtract, multiply, or divide mentally.

    Example 1 (Addition)

    600 + 300 = 900

    The numbers 600 and 300 are compatible for addition, because the sum of 900 can be easily calculated mentally.

    613 + 299 = 912

    The numbers 613 and 299 are not compatible for addition, since the sum (912) cannot be easily calculated mentally. To estimate 613 + 299, replace 613 and 299 with the compatible numbers 600 and 300. An estimate of 613 + 299 is found by mentally calculating 600 + 300 = 900.

    Example 2 (Subtraction)

    20.4 - 3.8 = 16.6

    The numbers 20.4 and 3.8 are not compatible for subtraction, since the difference (16.6) cannot be easily calculated mentally. To estimate 20.4 - 3.8, replace 20.4 and 3.8 with the compatible numbers 20 and 4. An estimate of 20.4 - 3.8 is found by mentally calculating 20 - 4 = 16.
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