Add 40/21 and 3/30
1st number: 1 19/21, 2nd number: 3/30
40/21 + 3/30 is 421/210.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
40/21 = 40 × 10/21 × 10 = 400/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
3/30 = 3 × 7/30 × 7 = 21/210 - Add the two like fractions:
400/210 + 21/210 = 400 + 21/210 = 421/210 - So, 40/21 + 3/30 = 421/210
In mixed form: 21/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21+3/30 40/21+6/30 40/42+3/30 40/21+3/60 40/21+9/30 40/63+3/30 40/21+3/90 40/21+15/30 40/21+21/30