Add 81/28 and 18/30
1st number: 2 25/28, 2nd number: 18/30
81/28 + 18/30 is 489/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 30 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 28 × 15 = 420,
81/28 = 81 × 15/28 × 15 = 1215/420 - Likewise, for the 2nd fraction, since 30 × 14 = 420,
18/30 = 18 × 14/30 × 14 = 252/420 - Add the two like fractions:
1215/420 + 252/420 = 1215 + 252/420 = 1467/420 - 1467/420 simplified gives 489/140
- So, 81/28 + 18/30 = 489/140
In mixed form: 369/140
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