Answers

Add 20/45 and 72/70

1^st number: 20/45, 2^nd number: 1 2/70

20/45 + 72/70 is 464/315.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 45 and 70 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 45 × 14 = 630,
   20/45 = 20 × 14/45 × 14 = 280/630
3. Likewise, for the 2nd fraction, since 70 × 9 = 630,
   72/70 = 72 × 9/70 × 9 = 648/630
4. Add the two like fractions:
   280/630 + 648/630 = 280 + 648/630 = 928/630
5. 928/630 simplified gives 464/315
6. So, 20/45 + 72/70 = 464/315
   In mixed form: 1149/315

MathStep (Works offline)

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

Related: ⁴⁰/₄₅+⁷²/₇₀ ²⁰/₉₀+⁷²/₇₀ ⁶⁰/₄₅+⁷²/₇₀

Add Fractions Calculator