Add 21/40 and 3/84
21/40 + 3/84 is 157/280.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 84 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 84 × 10 = 840,
3/84 = 3 × 10/84 × 10 = 30/840 - Add the two like fractions:
441/840 + 30/840 = 441 + 30/840 = 471/840 - 471/840 simplified gives 157/280
- So, 21/40 + 3/84 = 157/280
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