Add 21/40 and 18/21
21/40 + 18/21 is 387/280.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 21 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 40 × 21 = 840,
21/40 = 21 × 21/40 × 21 = 441/840 - Likewise, for the 2nd fraction, since 21 × 40 = 840,
18/21 = 18 × 40/21 × 40 = 720/840 - Add the two like fractions:
441/840 + 720/840 = 441 + 720/840 = 1161/840 - 1161/840 simplified gives 387/280
- So, 21/40 + 18/21 = 387/280
In mixed form: 1107/280
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