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