Answers

Add 90/40 and 15/84

1^st number: 2 10/40, 2^nd number: 15/84

90/40 + 15/84 is 17/7.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 40 and 84 is 840
   
   Next, find the equivalent fraction of both fractional numbers with denominator 840
2. For the 1st fraction, since 40 × 21 = 840,
   90/40 = 90 × 21/40 × 21 = 1890/840
3. Likewise, for the 2nd fraction, since 84 × 10 = 840,
   15/84 = 15 × 10/84 × 10 = 150/840
4. Add the two like fractions:
   1890/840 + 150/840 = 1890 + 150/840 = 2040/840
5. 2040/840 simplified gives 17/7
6. So, 90/40 + 15/84 = 17/7
   In mixed form: 23/7

MathStep (Works offline)

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

Related: ⁹⁰/₄₀+³⁰/₈₄ ⁹⁰/₈₀+¹⁵/₈₄ ⁹⁰/₄₀+⁴⁵/₈₄ ⁹⁰/₄₀+⁷⁵/₈₄

Add Fractions Calculator