Add 40/30 and 15/42
1st number: 1 10/30, 2nd number: 15/42
40/30 + 15/42 is 71/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
40/30 = 40 × 7/30 × 7 = 280/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
15/42 = 15 × 5/42 × 5 = 75/210 - Add the two like fractions:
280/210 + 75/210 = 280 + 75/210 = 355/210 - 355/210 simplified gives 71/42
- So, 40/30 + 15/42 = 71/42
In mixed form: 129/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/30+15/42 40/30+30/42 40/60+15/42 40/30+15/84 40/30+45/42 40/90+15/42 40/30+75/42