Add 90/30 and 42/70
1st number: 3 0/30, 2nd number: 42/70
90/30 + 42/70 is 18/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
90/30 = 90 × 7/30 × 7 = 630/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
42/70 = 42 × 3/70 × 3 = 126/210 - Add the two like fractions:
630/210 + 126/210 = 630 + 126/210 = 756/210 - 756/210 simplified gives 18/5
- So, 90/30 + 42/70 = 18/5
In mixed form: 33/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/30+84/70 90/60+42/70