OEF calculations --- Introduction ---

This module actually contains 4 exercises on calculation (addition of fractions, product of signed numbers, rules of priority).

Addition of fractions

Calculate the following : .
For that, reduce to the same denominator :
times times
=
     
times times
Then, do multiplications :
     
Last, add (or substract) numerators
And, if possible, simplify :

Priority rules

You have to calculate
.

Which operation are you going to do first ? Do it ! (you must simplify fractions) :
        

Multiplication of signed integers

Calculate :
=

Transformation by multiplication

How transforms the product of two numbers if one one number by and the other one by ? It is par
.
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