Answers

Add 90/84 and 12/70

1^st number: 1 6/84, 2^nd number: 12/70

90/84 + 12/70 is 87/70.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 70 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 84 × 5 = 420,
   90/84 = 90 × 5/84 × 5 = 450/420
3. Likewise, for the 2nd fraction, since 70 × 6 = 420,
   12/70 = 12 × 6/70 × 6 = 72/420
4. Add the two like fractions:
   450/420 + 72/420 = 450 + 72/420 = 522/420
5. 522/420 simplified gives 87/70
6. So, 90/84 + 12/70 = 87/70
   In mixed form: 117/70

MathStep (Works offline)

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

Related: ⁹⁰/₈₄+²⁴/₇₀ ⁹⁰/₈₄+³⁶/₇₀ ⁹⁰/₈₄+⁶⁰/₇₀ ⁹⁰/₈₄+⁸⁴/₇₀

Add Fractions Calculator