Integers

Definition / Summary / How To / Steps
 * How to ADD Integers**

Rule #1: If the signs are the same, the answer keeps the sign. Rule #2: If the signs are different, find the difference of the absolute value of the two numbers. Then take the sign of the integer with the greater absolute value.


 * How to SUBTRACT Integers**

Subtracting integers takes three simple steps. Rule #1: **Keep** the sign of the first integer. Rule #2: **Change** subtraction to addition. Rule #3: **Flip** the sign of the second integer.


 * How to MULTIPLY Integers**

Rule #1: If you the all the integers have the same sign **(+ or -),** your answer will be positive. Rule #2 : If they are different, your answer will be negative.


 * How to DIVIDE Integers**

Rule #1: If you the all the integers have the same sign **(+ or -),** your answer will be positive. Rule #2 : If they are different, your answer will be negative.

Easy Problems

4+3=? Answer: 7 -3x-5=? Answer: 15 -5/-1=? Answer: 5 51-12=? Answer: 39

If the elevator started on the 2nd floor in the basement and went up 3 floors, what floor would it end up on? Answer: The 1st floor

Medium Problems

20-(-42)=? Answer: 62 -5x12=? Answer: -60 60-(-53)=? Answer: 7

If a moutain started 300 feet below sea level and rose to 525 feet above sea level, how tall, in total, is the mountain? Answer: 825 feet

Hard Problems

35-(-54)=? Answer: 89 784x(-34)=? Answer: -26,656

Mr. Polizzi wanted to dig a hole for his pool. He has to dig the hole in 3 days. His hole has to be 367centimeters into the ground. On the first day, he dug 245 centimeters into the ground. Then the next day he took a break beacause it rained. Hence, the water filled it up 57 centimeters. How many centimeters does Mr. Polizzi have to dig on day 3? Answer: 179 centimeters

Pictures



Number line. [Online image] Available [], June 15th, 2010

Video