Answers

Add 9/84 and 12/40

9/84 + 12/40 is 57/140.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 40 is 840
   
   Next, find the equivalent fraction of both fractional numbers with denominator 840
2. For the 1st fraction, since 84 × 10 = 840,
   9/84 = 9 × 10/84 × 10 = 90/840
3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
   12/40 = 12 × 21/40 × 21 = 252/840
4. Add the two like fractions:
   90/840 + 252/840 = 90 + 252/840 = 342/840
5. 342/840 simplified gives 57/140
6. So, 9/84 + 12/40 = 57/140

MathStep (Works offline)

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

Related: ¹⁸/₈₄+¹²/₄₀ ⁹/₈₄+²⁴/₄₀ ⁹/₈₄+¹²/₈₀ ²⁷/₈₄+¹²/₄₀ ⁹/₈₄+³⁶/₄₀ ⁴⁵/₈₄+¹²/₄₀ ⁹/₈₄+⁶⁰/₄₀ ⁶³/₈₄+¹²/₄₀ ⁹/₈₄+⁸⁴/₄₀

Add Fractions Calculator