Add 81/9 and 70/20
1st number: 9 0/9, 2nd number: 3 10/20
81/9 + 70/20 is 25/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 9 × 20 = 180,
81/9 = 81 × 20/9 × 20 = 1620/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
70/20 = 70 × 9/20 × 9 = 630/180 - Add the two like fractions:
1620/180 + 630/180 = 1620 + 630/180 = 2250/180 - 2250/180 simplified gives 25/2
- So, 81/9 + 70/20 = 25/2
In mixed form: 121/2
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