Add 80/42 and 70/30
1st number: 1 38/42, 2nd number: 2 10/30
80/42 + 70/30 is 89/21.
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,
80/42 = 80 × 5/42 × 5 = 400/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
70/30 = 70 × 7/30 × 7 = 490/210 - Add the two like fractions:
400/210 + 490/210 = 400 + 490/210 = 890/210 - 890/210 simplified gives 89/21
- So, 80/42 + 70/30 = 89/21
In mixed form: 45/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/84+70/30 80/42+70/60 80/42+70/90