Add 54/21 and 28/40
1st number: 2 12/21, 2nd number: 28/40
54/21 + 28/40 is 229/70.
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,
54/21 = 54 × 40/21 × 40 = 2160/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
28/40 = 28 × 21/40 × 21 = 588/840 - Add the two like fractions:
2160/840 + 588/840 = 2160 + 588/840 = 2748/840 - 2748/840 simplified gives 229/70
- So, 54/21 + 28/40 = 229/70
In mixed form: 319/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/21+56/40 54/42+28/40 54/21+28/80 54/21+84/40 54/63+28/40