Add 40/21 and 3/8
1st number: 1 19/21, 2nd number: 3/8
40/21 + 3/8 is 383/168.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
40/21 = 40 × 8/21 × 8 = 320/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
3/8 = 3 × 21/8 × 21 = 63/168 - Add the two like fractions:
320/168 + 63/168 = 320 + 63/168 = 383/168 - So, 40/21 + 3/8 = 383/168
In mixed form: 247/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21+3/8 40/21+6/8 40/42+3/8 40/21+3/16 40/21+9/8 40/63+3/8 40/21+3/24 40/21+15/8 40/21+3/40 40/21+21/8 40/21+3/56