solve the following:
a) 4 by 5 + 11 by 20
b)10 by 9 - 2 by 7
Answers
Answered by
0
Answer:
a) 27/20
b) 52/63
Step-by-step explanation:
a) 4/5 + 11/20 = 16/20 + 11/20 = 27/20
(Made the denominator of the first fraction 20 by multiplying both the numerator and denominator by 4, because addition of fractions is only possible if they are like and the LCM of 5 and 20 is 20.)
b) 10/9 - 2/7 = 70/63 - 18/63 = 52/63
(LCM of (9, 7) = 63. Since, 9 and 7 don't have any common factors, to find the LCM just multiply them. You only have to use prime factorisation if the given two numbers have a common factor.)
Similar questions