Add 21/15 and 20/9
1st number: 1 6/15, 2nd number: 2 2/9
21/15 + 20/9 is 163/45.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 9 is 45
Next, find the equivalent fraction of both fractional numbers with denominator 45 - For the 1st fraction, since 15 × 3 = 45,
21/15 = 21 × 3/15 × 3 = 63/45 - Likewise, for the 2nd fraction, since 9 × 5 = 45,
20/9 = 20 × 5/9 × 5 = 100/45 - Add the two like fractions:
63/45 + 100/45 = 63 + 100/45 = 163/45 - So, 21/15 + 20/9 = 163/45
In mixed form: 328/45
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