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:


  • + += +
  • - -= +
  • + - = -
  • - += -
The + and - makes a - so you change the operation to this:



  • 4-5=
You subtract 5-4 and get the answer 1

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=

  • + + = +
  • - - = +
  • + - = -
  • - + = -
The - of -3 and the - of the subtraction makes a + so you change the operation to this:




  • 3+7=
Get the answer (which is 10) and then look at the bigger number and give the answer its sign. Answer: -10 because the 7 has the negative sign in front.


  • 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=
First you multiply normally


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
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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

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