Add 21/10 and 42/40
1st number: 2 1/10, 2nd number: 1 2/40
21/10 + 42/40 is 63/20.
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,
21/10 = 21 × 4/10 × 4 = 84/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
42/40 = 42 × 1/40 × 1 = 42/40 - Add the two like fractions:
84/40 + 42/40 = 84 + 42/40 = 126/40 - 126/40 simplified gives 63/20
- So, 21/10 + 42/40 = 63/20
In mixed form: 33/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/10+42/40 21/10+84/40 21/20+42/40 21/10+42/80 63/10+42/40 21/30+42/40 21/50+42/40 21/70+42/40