Add 63/42 and 54/40
1st number: 1 21/42, 2nd number: 1 14/40
63/42 + 54/40 is 57/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 42 × 20 = 840,
63/42 = 63 × 20/42 × 20 = 1260/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
54/40 = 54 × 21/40 × 21 = 1134/840 - Add the two like fractions:
1260/840 + 1134/840 = 1260 + 1134/840 = 2394/840 - 2394/840 simplified gives 57/20
- So, 63/42 + 54/40 = 57/20
In mixed form: 217/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/84+54/40 63/42+54/80