Add 21/60 and 18/81
21/60 + 18/81 is 103/180.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 60 and 81 is 1620
Next, find the equivalent fraction of both fractional numbers with denominator 1620 - For the 1st fraction, since 60 × 27 = 1620,
21/60 = 21 × 27/60 × 27 = 567/1620 - Likewise, for the 2nd fraction, since 81 × 20 = 1620,
18/81 = 18 × 20/81 × 20 = 360/1620 - Add the two like fractions:
567/1620 + 360/1620 = 567 + 360/1620 = 927/1620 - 927/1620 simplified gives 103/180
- So, 21/60 + 18/81 = 103/180
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