# E&M's math class

### created by: Ethan Frandsen and Matthew Watkins

## The basics of integers (subtracting and adding)

an integer is a whole number that can be positive or negative. If you are adding integers you would ignore the signs and find the difference. Also to make the answer have the sign of the larger number. For instance -29+15=? it equals 14 and it will take on the sign of the larger number which is a negative., so the answer is -14. If you subtracting integers the rules would be first to change the subtraction sign to addition. Then change the sign of the second number to the opposite. Finally to follow the rules of addition. For example I will use the same equation with subtraction. -29-15=? -29+-15=34 so your answer is 34.

## The basics of integers (dividing and multiplying)

If you are multiplying a negative times a negative it would equal a positive. If you are multiplying a negative times a positive the answer will be a negative. If you multiply a positive by a positive it equals a positive. A quick example of this is (-7)*(23)=? well 7*23=161 and it is a negative times a positive so it would equal -161. If you are dividing a negative and negative it would equal a positive. If you are dividing the same rules of multiplying apply. an example would be -183/3=61.