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Integer Rules

Math Mid-Term Project

Mikayla Bryant

on 13 March 2013

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Transcript of Integer Rules

INTEGERS Let's work on the rules with integers! In this presentation, you will learn how to correctly add,
subtract, multiply and divide integers! Let's get started! Adding Integers! You must only remember two rules:
When the signs are the same, you simply add and give the sum that same sign.
When the signs are different, subtract the lower number from the higher number, and the sum should have the sign of the higher number. By those rules I mean: If you are adding integers with the same sign,
all you do is at and keep the sign! If you are adding integers with different signs, it is like subtracting! You take the lower number and subtract it from
the higher number, leaving the answer. The sign of
the answer should be the sign of the higher number! Time to Subtract! There are some slightly different rules in subtracting integers. They are:
If the integers have the same sign, simply add the numbers, but keep the negative sign.
If the integers have different signs, you change the signs to positive, giving you a positive answer.
By that I mean: If the signs are the same, all you do is add them like a regular addition problems, but keep the sign negative. If the signs are different, shown in the picture above, there are two negative in the equation 3 - -2 = 5. Those negative turn into positives which turns into 3+2,
which then equals a positive 5. Time for Multiplication! The rules are very simple:
If the signs are the same, the answer will be positive. If the signs are different, the answer will be negative. By that I mean:
If you were to multiply two positive integers or two negative integers, the answer would be positive. If you were to multiply a positive and negative integer together (or vice versa), the answer will always be negative. When Diving integers... The rules are exactly the same!
Diving two of the same sign is always positive, while
diving two different signs is always negative. By that I mean: Exactly what I mean by multiplying integers.
Positive and positive is positive.
Negative and negative is positive.
Positive and negative is negative.
Negative and positive is negative. Examples: Addition:
3 + 5 = 8
-3 + 5 (5 - 3) = 2
6 - 2 = 4
6 - -2 (6 + 2) = 8
Multiplication: 4 * 3 = 12
4 * -3 = -12 Division: 10 / 2 = 5
10 / -2 = -5 Now you know
the rules of
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