Math Worksheet #8 – ANSWER KEY Topic: Basic Fractions cont. Name _____________________________________ Video A: Adding Fractions with Like Denominators Remember to reduce fractions. 5 1 6 2 3
5 1
Example: + = would result in + = ÷ = 8 8 8 2 4
8 8
1) 1 1
+ = (Show below) 4 4
5) 7
5
+
= 20 20
2) 4 2
+ = (Be sure to reduce) 9 9
6) 7 3
+ = 8 8
3) 5 7
+ = 12 12
7) 9 7
+ = 10 10
4) 3 1
+ = 7 7
8) 12 17
+
= 25 25
Video B: Least Common Multiple (LCM). Example: Find the LCM of 5, 8, and 10. Multiples of 5 are 5, 10, 15, 20, 25, 30, 35, 40 Multiples of 8 are 8, 16, 24, 32, 40 Multiples of 10 are 10, 20, 30, 40 The LCM of 5, 8, and 10 is 40 Find the LCM of the following: 9) 6, 9, 15 (Show below) 10) 10, 8, 12 11) 15, 25, 20 13) 16, 24, 32 12) 14, 7, 21 14) 10, 50, 30 Answers: 1)
1
3
5) 9) 90 11) 300 13) 96 2
5
2) 2
1
6) 1 10) 120 12) 42 14) 150 3
4
3
3) 1 7) 1 5
4) 4
4
8) 1 7
25
(Enter your score) Score = ___ / 14