Add 3/21 and 50/40
1st number: 3/21, 2nd number: 1 10/40
3/21 + 50/40 is 39/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 21 × 40 = 840,
3/21 = 3 × 40/21 × 40 = 120/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
50/40 = 50 × 21/40 × 21 = 1050/840 - Add the two like fractions:
120/840 + 1050/840 = 120 + 1050/840 = 1170/840 - 1170/840 simplified gives 39/28
- So, 3/21 + 50/40 = 39/28
In mixed form: 111/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/21+50/40 3/42+50/40 3/21+50/80 9/21+50/40 3/63+50/40 15/21+50/40