Add 90/80 and 90/42
1st number: 1 10/80, 2nd number: 2 6/42
90/80 + 90/42 is 183/56.
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,
90/80 = 90 × 21/80 × 21 = 1890/1680 - Likewise, for the 2nd fraction, since 42 × 40 = 1680,
90/42 = 90 × 40/42 × 40 = 3600/1680 - Add the two like fractions:
1890/1680 + 3600/1680 = 1890 + 3600/1680 = 5490/1680 - 5490/1680 simplified gives 183/56
- So, 90/80 + 90/42 = 183/56
In mixed form: 315/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/80+90/84