Answers

Add 90/54 and 21/40

1^st number: 1 36/54, 2^nd number: 21/40

90/54 + 21/40 is 263/120.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 54 and 40 is 1080
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1080
2. For the 1st fraction, since 54 × 20 = 1080,
   90/54 = 90 × 20/54 × 20 = 1800/1080
3. Likewise, for the 2nd fraction, since 40 × 27 = 1080,
   21/40 = 21 × 27/40 × 27 = 567/1080
4. Add the two like fractions:
   1800/1080 + 567/1080 = 1800 + 567/1080 = 2367/1080
5. 2367/1080 simplified gives 263/120
6. So, 90/54 + 21/40 = 263/120
   In mixed form: 223/120

MathStep (Works offline)

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

Related: ⁹⁰/₅₄+⁴²/₄₀ ⁹⁰/₅₄+²¹/₈₀ ⁹⁰/₅₄+⁶³/₄₀

Add Fractions Calculator