Add 72/40 and 6/21
1st number: 1 32/40, 2nd number: 6/21
72/40 + 6/21 is 73/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 21 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 40 × 21 = 840,
72/40 = 72 × 21/40 × 21 = 1512/840 - Likewise, for the 2nd fraction, since 21 × 40 = 840,
6/21 = 6 × 40/21 × 40 = 240/840 - Add the two like fractions:
1512/840 + 240/840 = 1512 + 240/840 = 1752/840 - 1752/840 simplified gives 73/35
- So, 72/40 + 6/21 = 73/35
In mixed form: 23/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/40+12/21 72/80+6/21 72/40+6/42 72/40+18/21 72/40+6/63 72/40+30/21 72/40+42/21