Adding Fractions with Unlike Denominators
-11x/15 + 4/5 =1/3
x= 7/11
4/5 - 1/3 =
12/15 - 5/15 = 7/15
1/2 and 3/5
LCD = 10
If the denominators are the same for two fractions, do we have to find the least common denominator (LCD)?
No, we can add or subtract the fractions as is.
Whole numbers starts from _____
0
True or False:
4/9 + 1/6 = 10/18
False.
8/18 + 3/18 = 11/18
True or False:
4/3 - 2/7 = 1 1/21
True.
28/21 - 6/21 =
22/21 OR 1 1/21
5/12 and 2/9
LCD: 36
What is the first thing you do when you are adding or subtracting fractions with unlike denominators?
Find the least common denominator (LCD) for all of the fractions.
0.5 repeating rational or irrational
rational
11/12 + 7/15 =
55/60 + 28/60 =
83/60 OR 1 23/60
11/12 - 7/15 =
55/60 - 28/60 =
27/60
reduced form: 9/20
-(4x)/7 * (-2x)/5
LCD: 42
(8x^2)/35
Add and subtract 3/4 and 1/5
15/20 and 4/20
Addition = 19/20
Subtraction= 11/20
Write this as a fraction:
0.321 ( just 21 repeats)
53/165
1/2 + 1/3 + 1/4 =
6/12 + 4/12 + 3/12 =
13/12 OR 1 1/12
6/7 - 1/2 - 1/28 =
24/28 - 14/28 - 1/28 = 9/28
-40/77 div (-44)
10/847
What are 2 ways you can get two fractions with unlike denominators to have the same denominator?
1) Find the least common denominator (LCD)
2) Multiply the two denominators by one another
Use the order of operations (PEMDAS) to make this equation true:
7 + 4 x 3 - 4 = 29
[(7 + 4) x 3] - 4 = 29
-5/48=-5/6+5x/16
2 and 1/3
7x/8-9/10=-1/8
31/35
1 29/35 div 1 11/21 + 7/15
1 2/3
Find the product
-3 3/20 * (-2 14/23)
8 5/23
Order the numbers from least to greatest:
0.21, 2.3, 8/3, -0.1, -1/5, 0.2 (repeating)
-1/5, -0.1, 0.21, 0.2 repeating, 2.3, 8/3