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Old 30-09-2005, 11:13   #2
danielf
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Re: Not allowed to use calculator

Quote:
Originally Posted by liamboyle06
Hi All, what a great Friday Morning

I am not allowed to use a calculator(could however) but for a Paper I am doing, I need to Multiple 39.6 by 49.5 and show all the long calculations for it.
I already did the approx one and got 2000, but how do I multiple the decimals and add them in and record it all down?

Any suggestions would be very beneficial.
Multiply 39.6 by 50. 50*39.6 = 5* 396 = 5*400 - (5*4) = 2000 - 20 = 1980
Now subtract 0.5 * 39.6 = 19.8

1980 - 19.8 = 1960.2 Easy...
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