Answers

Add 15/42 and 90/45

1^st number: 15/42, 2^nd number: 2 0/45

15/42 + 90/45 is 33/14.

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,
   15/42 = 15 × 15/42 × 15 = 225/630
3. Likewise, for the 2nd fraction, since 45 × 14 = 630,
   90/45 = 90 × 14/45 × 14 = 1260/630
4. Add the two like fractions:
   225/630 + 1260/630 = 225 + 1260/630 = 1485/630
5. 1485/630 simplified gives 33/14
6. So, 15/42 + 90/45 = 33/14
   In mixed form: 25/14

MathStep (Works offline)

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

Related: ³⁰/₄₂+⁹⁰/₄₅ ¹⁵/₈₄+⁹⁰/₄₅ ⁴⁵/₄₂+⁹⁰/₄₅ ⁷⁵/₄₂+⁹⁰/₄₅

Add Fractions Calculator