Add 21/12 and 1/40
1st number: 1 9/12, 2nd number: 1/40
21/12 + 1/40 is 71/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 40 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 12 × 10 = 120,
21/12 = 21 × 10/12 × 10 = 210/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
1/40 = 1 × 3/40 × 3 = 3/120 - Add the two like fractions:
210/120 + 3/120 = 210 + 3/120 = 213/120 - 213/120 simplified gives 71/40
- So, 21/12 + 1/40 = 71/40
In mixed form: 131/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12+1/40 21/12+2/40 21/24+1/40 21/12+1/80 63/12+1/40 21/12+3/40 21/36+1/40 21/12+5/40 21/60+1/40 21/12+7/40 21/84+1/40