Add 21/8 and 3/15
1st number: 2 5/8, 2nd number: 3/15
21/8 + 3/15 is 113/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 15 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 8 × 15 = 120,
21/8 = 21 × 15/8 × 15 = 315/120 - Likewise, for the 2nd fraction, since 15 × 8 = 120,
3/15 = 3 × 8/15 × 8 = 24/120 - Add the two like fractions:
315/120 + 24/120 = 315 + 24/120 = 339/120 - 339/120 simplified gives 113/40
- So, 21/8 + 3/15 = 113/40
In mixed form: 233/40
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