Answers

Add 90/72 and 42/35

1^st number: 1 18/72, 2^nd number: 1 7/35

90/72 + 42/35 is 49/20.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 72 and 35 is 2520
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2520
2. For the 1st fraction, since 72 × 35 = 2520,
   90/72 = 90 × 35/72 × 35 = 3150/2520
3. Likewise, for the 2nd fraction, since 35 × 72 = 2520,
   42/35 = 42 × 72/35 × 72 = 3024/2520
4. Add the two like fractions:
   3150/2520 + 3024/2520 = 3150 + 3024/2520 = 6174/2520
5. 6174/2520 simplified gives 49/20
6. So, 90/72 + 42/35 = 49/20
   In mixed form: 29/20

MathStep (Works offline)

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

Related: ⁹⁰/₇₂+⁸⁴/₃₅ ⁹⁰/₇₂+⁴²/₇₀

Add Fractions Calculator