the shortcut way of dividing is mutiplying
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The multiple of ten can be reduced to the smaller number by moving the decimal place of the numerator one place to the left. However, this may only be a marginal short cut. For example, dividing 1256 by 3450 is equivalent to dividing 125.6 by 345 but that is hardly a shortcut!
Move the decimal point two places to the left. It is the same as dividing by 100.
Move the decimal point, the same number of places as the power of 10. That way ---> to multiply. This way <--- to divide.
In principle, you can count backwards; or use some shortcut (such as calculating the number of days, dividing by 7, and obtaining the remainder).
Divisor