Add 12/10 and 21/40
1st number: 1 2/10, 2nd number: 21/40
12/10 + 21/40 is 69/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 40 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 10 × 4 = 40,
12/10 = 12 × 4/10 × 4 = 48/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
21/40 = 21 × 1/40 × 1 = 21/40 - Add the two like fractions:
48/40 + 21/40 = 48 + 21/40 = 69/40 - So, 12/10 + 21/40 = 69/40
In mixed form: 129/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/10+21/40 12/10+42/40 12/20+21/40 12/10+21/80 36/10+21/40 12/10+63/40 12/30+21/40 60/10+21/40 12/50+21/40 84/10+21/40 12/70+21/40