Answers

Add 40/90 and 90/70

1^st number: 40/90, 2^nd number: 1 20/70

40/90 + 90/70 is 109/63.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 70 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 90 × 7 = 630,
   40/90 = 40 × 7/90 × 7 = 280/630
3. Likewise, for the 2nd fraction, since 70 × 9 = 630,
   90/70 = 90 × 9/70 × 9 = 810/630
4. Add the two like fractions:
   280/630 + 810/630 = 280 + 810/630 = 1090/630
5. 1090/630 simplified gives 109/63
6. So, 40/90 + 90/70 = 109/63
   In mixed form: 146/63

MathStep (Works offline)

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

Related: ⁸⁰/₉₀+⁹⁰/₇₀

Add Fractions Calculator