Add 21/8 and 12/40
1st number: 2 5/8, 2nd number: 12/40
21/8 + 12/40 is 117/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 40 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 8 × 5 = 40,
21/8 = 21 × 5/8 × 5 = 105/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
12/40 = 12 × 1/40 × 1 = 12/40 - Add the two like fractions:
105/40 + 12/40 = 105 + 12/40 = 117/40 - So, 21/8 + 12/40 = 117/40
In mixed form: 237/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/8+12/40 21/8+24/40 21/16+12/40 21/8+12/80 63/8+12/40 21/8+36/40 21/24+12/40 21/8+60/40 21/40+12/40 21/8+84/40 21/56+12/40