Add 30/80 and 84/42
1st number: 30/80, 2nd number: 2 0/42
30/80 + 84/42 is 19/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 42 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 80 × 21 = 1680,
30/80 = 30 × 21/80 × 21 = 630/1680 - Likewise, for the 2nd fraction, since 42 × 40 = 1680,
84/42 = 84 × 40/42 × 40 = 3360/1680 - Add the two like fractions:
630/1680 + 3360/1680 = 630 + 3360/1680 = 3990/1680 - 3990/1680 simplified gives 19/8
- So, 30/80 + 84/42 = 19/8
In mixed form: 23/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/80+84/42 90/80+84/42