Add 21/3 and 15/40
1st number: 7 0/3, 2nd number: 15/40
21/3 + 15/40 is 59/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 40 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 3 × 40 = 120,
21/3 = 21 × 40/3 × 40 = 840/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
15/40 = 15 × 3/40 × 3 = 45/120 - Add the two like fractions:
840/120 + 45/120 = 840 + 45/120 = 885/120 - 885/120 simplified gives 59/8
- So, 21/3 + 15/40 = 59/8
In mixed form: 73/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/3+15/40 21/3+30/40 21/6+15/40 21/3+15/80 63/3+15/40 21/3+45/40 21/9+15/40 21/3+75/40 21/15+15/40