Answers

Add 70/42 and 42/72

1^st number: 1 28/42, 2^nd number: 42/72

70/42 + 42/72 is 9/4.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 72 is 504
   
   Next, find the equivalent fraction of both fractional numbers with denominator 504
2. For the 1st fraction, since 42 × 12 = 504,
   70/42 = 70 × 12/42 × 12 = 840/504
3. Likewise, for the 2nd fraction, since 72 × 7 = 504,
   42/72 = 42 × 7/72 × 7 = 294/504
4. Add the two like fractions:
   840/504 + 294/504 = 840 + 294/504 = 1134/504
5. 1134/504 simplified gives 9/4
6. So, 70/42 + 42/72 = 9/4
   In mixed form: 21/4

MathStep (Works offline)

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

Related: ⁷⁰/₄₂+⁸⁴/₇₂ ⁷⁰/₈₄+⁴²/₇₂

Add Fractions Calculator