legacydst wrote:

I am looking for a strategy that will help me calculate 138/.82 fast. I am having the hardest time learning how to divide decimals fast. Thanks

\(\frac{138}{.82}=\frac{138}{82*10^{-2}}=\frac{138}{82}*10^2=\frac{69}{41}*100\)

Multiply numerator & denominator by 5 as 40*5=200

\(\frac{69*5}{41*5}*100=\frac{69*5}{200}*100=\frac{69*5}{2}=35*5=175\)

Result should be less than 175.

If you have choices as 165, 167, 169, 170, 171, better use long division of 69/41 and multiply by 100 by shifting decimal 2 digits to the right.

_________________

~fluke

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