Add 5/21 and 9/54
5/21 + 9/54 is 17/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 54 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 21 × 18 = 378,
5/21 = 5 × 18/21 × 18 = 90/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
9/54 = 9 × 7/54 × 7 = 63/378 - Add the two like fractions:
90/378 + 63/378 = 90 + 63/378 = 153/378 - 153/378 simplified gives 17/42
- So, 5/21 + 9/54 = 17/42
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