Add 7/81 and 20/80
7/81 + 20/80 is 109/324.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 80 is 6480
Next, find the equivalent fraction of both fractional numbers with denominator 6480 - For the 1st fraction, since 81 × 80 = 6480,
7/81 = 7 × 80/81 × 80 = 560/6480 - Likewise, for the 2nd fraction, since 80 × 81 = 6480,
20/80 = 20 × 81/80 × 81 = 1620/6480 - Add the two like fractions:
560/6480 + 1620/6480 = 560 + 1620/6480 = 2180/6480 - 2180/6480 simplified gives 109/324
- So, 7/81 + 20/80 = 109/324
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