Add 90/30 and 16/42
1st number: 3 0/30, 2nd number: 16/42
90/30 + 16/42 is 71/21.
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,
90/30 = 90 × 7/30 × 7 = 630/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
16/42 = 16 × 5/42 × 5 = 80/210 - Add the two like fractions:
630/210 + 80/210 = 630 + 80/210 = 710/210 - 710/210 simplified gives 71/21
- So, 90/30 + 16/42 = 71/21
In mixed form: 38/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/30+32/42 90/60+16/42 90/30+16/84 90/30+48/42 90/30+80/42