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math 101 week 1 fractions and lcm

by: Kellee Thomas

math 101 week 1 fractions and lcm Math 101

Marketplace > Northern Illinois University > Mathmatics > Math 101 > math 101 week 1 fractions and lcm
Kellee Thomas


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these notes cover whats going to be in our exam this friday during class i have more on the way. it takes you through it step by step so you should be able to have it together in no time.
College Algebra
Mr. kugel
Class Notes
mathn, Math CollegeAlgebra
25 ?




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This 5 page Class Notes was uploaded by Kellee Thomas on Monday September 12, 2016. The Class Notes belongs to Math 101 at Northern Illinois University taught by Mr. kugel in Fall 2016. Since its upload, it has received 59 views. For similar materials see College Algebra in Mathmatics at Northern Illinois University.


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Date Created: 09/12/16
Kellee math course notes Math 101 Section: R.1 – Fractions and LCM (least common multiple Natural numbers whole numbers integers fractions 1,2,3…. 0,1,2,3…. -2,-1,0,1,2… 10/9, 6/5, 4/π Least common multiple 1) Cannot find the LCM of one number. It has to be at east two numbers. Example: Least common multiple of 6 and 8 6 = 6, 12, 18, 24 the least common multiple pf 6 and 8 is 24 because its common 8 = 8, 16, 24 2) Finding the LCM using a factor tree 3) Find the LCM using a factor tree of 36 and 56 4) Find the LCM using factor tree of 16, 18, and 20 5) Whats the LCM of 144 and 210 FRACTIONS: Addition and subtraction: Add straight across. No matter what when dealing with adding and subtracting fractions the denominator HAS to be the same. Example: When not the same multiply the least common multiple. Whatever you do to the bottom you have to do to the top. multiplication and division: when multiplying and dividing fractions the denominator does not matter at all. When you multiply all you have to do is multiply straight across. Example: When you are dividing the fractions you have to flip the second fraction. After you flip that fraction you multiply straight across and you should have your answer if you do it right. Example: More examples: 2/3 + 5/4 = 23 is a prime number so this fraction is already reduced. Find the LCD (least common dominator) of ½ and 1/54 When reducing fractions you have to find one number that goes into the both equally. Example: 5/30 - you would divide them both by 5 which will give you 1/6 22/34 – you would divide them both by 2 which will give you 11/17 3/12 – you would divide them both by 3 which will give you ¼


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