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How to divide a large number by 5 in seconds?



Step 1: Multiply the number by 2.
Step 2: Move the decimal point in the product one place to the left.
EXAMPLE: 195 / 5,
Step 1: 195 x 2 = 390.0
Step 2: Move the decimal one place to the left: 39.0 Try 392978 / 5! 



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