Add 54/42 and 40/30
1st number: 1 12/42, 2nd number: 1 10/30
54/42 + 40/30 is 55/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
54/42 = 54 × 5/42 × 5 = 270/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
40/30 = 40 × 7/30 × 7 = 280/210 - Add the two like fractions:
270/210 + 280/210 = 270 + 280/210 = 550/210 - 550/210 simplified gives 55/21
- So, 54/42 + 40/30 = 55/21
In mixed form: 213/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/42+80/30 54/84+40/30 54/42+40/60 54/42+40/90