Answers

Add 72/42 and 30/45

1^st number: 1 30/42, 2^nd number: 30/45

72/42 + 30/45 is 50/21.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 45 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 42 × 15 = 630,
   72/42 = 72 × 15/42 × 15 = 1080/630
3. Likewise, for the 2nd fraction, since 45 × 14 = 630,
   30/45 = 30 × 14/45 × 14 = 420/630
4. Add the two like fractions:
   1080/630 + 420/630 = 1080 + 420/630 = 1500/630
5. 1500/630 simplified gives 50/21
6. So, 72/42 + 30/45 = 50/21
   In mixed form: 28/21

MathStep (Works offline)

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

Related: ⁷²/₄₂+⁶⁰/₄₅ ⁷²/₈₄+³⁰/₄₅ ⁷²/₄₂+³⁰/₉₀ ⁷²/₄₂+⁹⁰/₄₅

Add Fractions Calculator