Add 12/4 and 21/40
1st number: 3 0/4, 2nd number: 21/40
12/4 + 21/40 is 141/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 40 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 4 × 10 = 40,
12/4 = 12 × 10/4 × 10 = 120/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
21/40 = 21 × 1/40 × 1 = 21/40 - Add the two like fractions:
120/40 + 21/40 = 120 + 21/40 = 141/40 - So, 12/4 + 21/40 = 141/40
In mixed form: 321/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/4+21/40 12/4+42/40 12/8+21/40 12/4+21/80 36/4+21/40 12/4+63/40 60/4+21/40 12/20+21/40 84/4+21/40 12/28+21/40