**Rule 20:****Multiplication and division must be completed before addition and subtraction.**

**Problem 3:**Calculate .**Answer:**The answer is -11.**Solution:**-
The problem contains addition and subtraction. Solve it was you would if you were entering the numbers into your calculator. The calculator will go through the following steps:
**Solution 2:**-
You could also solve the problem by grouping
each pair of number.
The problem

could be written and again as .

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Author: Nancy Marcus

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