1 / 9

Ch. 8 Integers

Ch. 8 Integers. Understanding Rational Numbers. A rational number is any number that can be written as a quotient a/b, where a and b are integers and b is NOT equal to 0. Examples: 3 1/8, -0.28 and 5 are all rational numbers because they can be written as 25/8, -28/100, and 5/1.

zeus-rivers
Download Presentation

Ch. 8 Integers

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Ch. 8 Integers

  2. Understanding Rational Numbers • A rational number is any number that can be written as a quotient a/b, where a and b are integers and b is NOT equal to 0. • Examples: 3 1/8, -0.28 and 5 are all rational numbers because they can be written as 25/8, -28/100, and 5/1.

  3. Graph the rational numbers on the number line. 1) -1 3/8 2) 0.75 3) -7/8 4) -1/8

  4. Adding Integers • IMPORTANT THINGS TO REMEMBER: • When adding two negative numbers the answer will always be negative. Ex. -5 + -7= -12 • If you are adding a positive and a negative number. Look to see which number is larger. The larger number’s sign (+, -) will decide if the answer will be positive or negative. Ex. 5+ -7 = 7 is the bigger number so the answer will be a negative number. Ex. -6 + 11= 11 is the bigger number so the answer will be a positive number.

  5. Problems • -4 + -18 = • 17 + -29= • -4 + -5 = • -8+ -5 + 6= • -18+ 18= • -20+ 4= • -3+ 2+ 2=

  6. Subtracting Integers • IMPORTANT THINGS TO REMEMBER! • When subtracting two positive numbers look at the 1st number. If it is less than the second number the answer will be negative. Ex. 10-12= -2 • When you are subtracting a negative and a positive number your answer is essentially adding two negative numbers and your answer will be negative. Ex. -12-6= or -12+-6= -18

  7. Subtracting continued • IMPORTANT THINGS TO REMEMBER! • When you have two negatives in a row (a subtraction sign and a negative sign) it cancels each other out and changes to a positive. Ex. 6-(-4)= There are two negatives in a row so it changes to 6+4=10 Just like English- you cannot have a double negative in a sentence! What about -2-(-7)?

  8. Problems • -6-3= • -8-(-8)= • 7-12= If n=-3 evaluate each expression. 4. n-(-19)= 5. -1-n= 6. 7- l n l –(-11)=

More Related