Add 40/42 and 10/30
40/42 + 10/30 is 9/7.
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,
40/42 = 40 × 5/42 × 5 = 200/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
10/30 = 10 × 7/30 × 7 = 70/210 - Add the two like fractions:
200/210 + 70/210 = 200 + 70/210 = 270/210 - 270/210 simplified gives 9/7
- So, 40/42 + 10/30 = 9/7
In mixed form: 12/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/42+10/30 40/42+20/30 40/84+10/30 40/42+10/60 40/42+10/90 40/42+50/30 40/42+70/30