Add 12/40 and 27/21
1st number: 12/40, 2nd number: 1 6/21
12/40 + 27/21 is 111/70.
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,
12/40 = 12 × 21/40 × 21 = 252/840 - Likewise, for the 2nd fraction, since 21 × 40 = 840,
27/21 = 27 × 40/21 × 40 = 1080/840 - Add the two like fractions:
252/840 + 1080/840 = 252 + 1080/840 = 1332/840 - 1332/840 simplified gives 111/70
- So, 12/40 + 27/21 = 111/70
In mixed form: 141/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/40+27/21 12/40+54/21 12/80+27/21 12/40+27/42 36/40+27/21 12/40+81/21 12/40+27/63 60/40+27/21 84/40+27/21