Add 81/21 and 70/9
1st number: 3 18/21, 2nd number: 7 7/9
81/21 + 70/9 is 733/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
81/21 = 81 × 3/21 × 3 = 243/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
70/9 = 70 × 7/9 × 7 = 490/63 - Add the two like fractions:
243/63 + 490/63 = 243 + 490/63 = 733/63 - So, 81/21 + 70/9 = 733/63
In mixed form: 1140/63
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