Answers

Add 72/70 and 42/80

1^st number: 1 2/70, 2^nd number: 42/80

72/70 + 42/80 is 87/56.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 80 is 560
   
   Next, find the equivalent fraction of both fractional numbers with denominator 560
2. For the 1st fraction, since 70 × 8 = 560,
   72/70 = 72 × 8/70 × 8 = 576/560
3. Likewise, for the 2nd fraction, since 80 × 7 = 560,
   42/80 = 42 × 7/80 × 7 = 294/560
4. Add the two like fractions:
   576/560 + 294/560 = 576 + 294/560 = 870/560
5. 870/560 simplified gives 87/56
6. So, 72/70 + 42/80 = 87/56
   In mixed form: 131/56

MathStep (Works offline)

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

Related: ⁷²/₇₀+⁸⁴/₈₀

Add Fractions Calculator