The LCD of 7 and 77 is 77.
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19 is prime, so multiply 19 by 112.
LCM(6, 20, 19) = 1140
The LCD of 9/20 and 19/46 is 460.
A common denominator is 209, as is any multiple of 209.
1/5 + 3/4 First you have to find the common Denominator. The common denominator is 20. 1/5 = 4/20 (5x4=20, so you have to multiply the 1 by 4 as well) 3/4=15/20 (4x5=20 and 3x5=15) Now that you know your common denominator is 20, you can now add your fractions. 4/20 + 15/20 = 19/20 (you only add the numerator, the denominator stays the same) so, your answer is...... 19/20