หารด้วยทศนิยม

To divide by a decimal, it is convenient to make the divisor a whole number. Rule: shift the point in the dividend and divisor by the same number of places to the right until the divisor becomes a whole number. The value of the quotient does not change. Example:

8.4\div 0.4

. Shift the point one place:

84\div 4=21

. So

8.4\div 0.4=21

Turn the divisor into a whole number

Shift the point in both numbers by the same number of places

Then divide in the usual way

Worked examples

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