# Integer Operations

### Addition, Subtraction, Multiplication and Division!

## By: Fernando Cardenas and María José Villarreal 6B

## Addition

Here you will learn how to add integers.

+= positive

- =negative

- 4+(-5)=

First you have to follow this rules:

- + += +
- - -= +
- + - = -
- - += -

- 4-5=

Since the biggest number is negative then the answer will be negative -1

- -9 + 4= -5
- -3 + 3= 0

## Subtraction

Here you will learn how to subtract integers.

+ = positive

- = negative

- -3 - 7=

- + + = +
- - - = +
- + - = -
- - + = -

- 3+7=

- 5 - (-3)= 8
- 8 - 10= -2

## Multiplication

Here you will learn how to multiply integers.

Rules:

- Same signs: positive product
- Different signs: negative product

- -5 · 3=

Next you look for the signs

Last you follow the rules for the product sign

- -5 · 3= 15
- 1 - and 1 += -
- So answer is -15

- 6 · -2= -12
- -4 · (-5)= 20

## Division

Here you will learn how to divide integers.

- Same signs: positive quotient
- Different signs: negative quotient

- 12/(-3)=

First divide normally

Then look the signs

Last give the correct sign for the quotient

- 12/(-3)= 4
- 1 + and 1 -
- 12/(-3)= -4

- -14/7= -2
- -30/(-15)= 2