Add 70/21 and 54/40
1st number: 3 7/21, 2nd number: 1 14/40
70/21 + 54/40 is 281/60.
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,
70/21 = 70 × 40/21 × 40 = 2800/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
54/40 = 54 × 21/40 × 21 = 1134/840 - Add the two like fractions:
2800/840 + 1134/840 = 2800 + 1134/840 = 3934/840 - 3934/840 simplified gives 281/60
- So, 70/21 + 54/40 = 281/60
In mixed form: 441/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/42+54/40 70/21+54/80 70/63+54/40