Answers

Add 63/84 and 9/40

63/84 + 9/40 is 39/40.

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,
   63/84 = 63 × 10/84 × 10 = 630/840
3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
   9/40 = 9 × 21/40 × 21 = 189/840
4. Add the two like fractions:
   630/840 + 189/840 = 630 + 189/840 = 819/840
5. 819/840 simplified gives 39/40
6. So, 63/84 + 9/40 = 39/40

MathStep (Works offline)

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

Related: ⁶³/₈₄+¹⁸/₄₀ ⁶³/₈₄+⁹/₈₀ ⁶³/₈₄+²⁷/₄₀ ⁶³/₈₄+⁴⁵/₄₀ ⁶³/₈₄+⁶³/₄₀

Add Fractions Calculator