Add 20/15 and 21/45
1st number: 1 5/15, 2nd number: 21/45
20/15 + 21/45 is 9/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 45 is 45
Next, find the equivalent fraction of both fractional numbers with denominator 45 - For the 1st fraction, since 15 × 3 = 45,
20/15 = 20 × 3/15 × 3 = 60/45 - Likewise, for the 2nd fraction, since 45 × 1 = 45,
21/45 = 21 × 1/45 × 1 = 21/45 - Add the two like fractions:
60/45 + 21/45 = 60 + 21/45 = 81/45 - 81/45 simplified gives 9/5
- So, 20/15 + 21/45 = 9/5
In mixed form: 14/5
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