Add 12/21 and 20/18
1st number: 12/21, 2nd number: 1 2/18
12/21 + 20/18 is 106/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 21 × 6 = 126,
12/21 = 12 × 6/21 × 6 = 72/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
20/18 = 20 × 7/18 × 7 = 140/126 - Add the two like fractions:
72/126 + 140/126 = 72 + 140/126 = 212/126 - 212/126 simplified gives 106/63
- So, 12/21 + 20/18 = 106/63
In mixed form: 143/63
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