Add 21/27 and 42/60
21/27 + 42/60 is 133/90.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 60 is 540
Next, find the equivalent fraction of both fractional numbers with denominator 540 - For the 1st fraction, since 27 × 20 = 540,
21/27 = 21 × 20/27 × 20 = 420/540 - Likewise, for the 2nd fraction, since 60 × 9 = 540,
42/60 = 42 × 9/60 × 9 = 378/540 - Add the two like fractions:
420/540 + 378/540 = 420 + 378/540 = 798/540 - 798/540 simplified gives 133/90
- So, 21/27 + 42/60 = 133/90
In mixed form: 143/90
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