Short-Cut Math by Gerard W. Kelly

Author:Gerard W. Kelly
Language: eng
Format: epub, pdf
ISBN: 9780486131528
Publisher: Dover Publications
Published: 2012-07-17T16:00:00+00:00

Proving the answer:

5-7. To Divide by .25, 2.5, 25, or 250

A. To divide a number by .25, multiply the number by 4. Multiplying by 4 is the same as dividing by which is equivalent to ..

Example: 71 ÷ .25

Solution: 71 × 4 = 284, answer

Proving the answer:

B. To divide a number by 2.5, multiply the number by 4 and divide by 10. This is the same as multiplying by which is equivalent to dividing by which equals .

Example: 52 ÷ 2.5

Solution: 52 × 4 = 208; ÷ 10 = 20.8, answer

Proving the answer:

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