How do you subtract #8.47- 5.079#?

1 Answer
Gió
Mar 18, 2017

I got #3.391#

Explanation:

Ok, you could use a calculator but this is not fun.
We can use our good rules to subtract numbers in columns paying attention that the points must stay one on top of the other!
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Starting from the last zero I get a #1# from the #7# (that becomes #6#) and I get #10-1=9#;
Next I get another #1# from the #4# (that becomes #3#) and I do #16-7=9#. The next will be the #3-0=3# and finally #8-5=3#.

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