Answers

Add 30/21 and 7/15

1^st number: 1 9/21, 2^nd number: 7/15

30/21 + 7/15 is 199/105.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 15 is 105
   
   Next, find the equivalent fraction of both fractional numbers with denominator 105
2. For the 1st fraction, since 21 × 5 = 105,
   30/21 = 30 × 5/21 × 5 = 150/105
3. Likewise, for the 2nd fraction, since 15 × 7 = 105,
   7/15 = 7 × 7/15 × 7 = 49/105
4. Add the two like fractions:
   150/105 + 49/105 = 150 + 49/105 = 199/105
5. So, 30/21 + 7/15 = 199/105
   In mixed form: 194/105

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad

Related: ⁶⁰/₂₁+⁷/₁₅ ³⁰/₂₁+¹⁴/₁₅ ³⁰/₄₂+⁷/₁₅ ³⁰/₂₁+⁷/₃₀ ⁹⁰/₂₁+⁷/₁₅ ³⁰/₂₁+²¹/₁₅ ³⁰/₆₃+⁷/₁₅ ³⁰/₂₁+⁷/₄₅ ³⁰/₂₁+³⁵/₁₅ ³⁰/₂₁+⁷/₇₅ ³⁰/₂₁+⁴⁹/₁₅

Add Fractions Calculator