Add 72/21 and 27/40
1st number: 3 9/21, 2nd number: 27/40
72/21 + 27/40 is 1149/280.
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,
72/21 = 72 × 40/21 × 40 = 2880/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
27/40 = 27 × 21/40 × 21 = 567/840 - Add the two like fractions:
2880/840 + 567/840 = 2880 + 567/840 = 3447/840 - 3447/840 simplified gives 1149/280
- So, 72/21 + 27/40 = 1149/280
In mixed form: 429/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/21+54/40 72/42+27/40 72/21+27/80 72/21+81/40 72/63+27/40