Add 81/21 and 70/56
1st number: 3 18/21, 2nd number: 1 14/56
81/21 + 70/56 is 143/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 56 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
81/21 = 81 × 8/21 × 8 = 648/168 - Likewise, for the 2nd fraction, since 56 × 3 = 168,
70/56 = 70 × 3/56 × 3 = 210/168 - Add the two like fractions:
648/168 + 210/168 = 648 + 210/168 = 858/168 - 858/168 simplified gives 143/28
- So, 81/21 + 70/56 = 143/28
In mixed form: 53/28
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