Add 81/15 and 70/20
1st number: 5 6/15, 2nd number: 3 10/20
81/15 + 70/20 is 89/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 20 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 15 × 4 = 60,
81/15 = 81 × 4/15 × 4 = 324/60 - Likewise, for the 2nd fraction, since 20 × 3 = 60,
70/20 = 70 × 3/20 × 3 = 210/60 - Add the two like fractions:
324/60 + 210/60 = 324 + 210/60 = 534/60 - 534/60 simplified gives 89/10
- So, 81/15 + 70/20 = 89/10
In mixed form: 89/10
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