Add 90/70 and 28/27
1st number: 1 20/70, 2nd number: 1 1/27
90/70 + 28/27 is 439/189.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 27 is 1890
Next, find the equivalent fraction of both fractional numbers with denominator 1890 - For the 1st fraction, since 70 × 27 = 1890,
90/70 = 90 × 27/70 × 27 = 2430/1890 - Likewise, for the 2nd fraction, since 27 × 70 = 1890,
28/27 = 28 × 70/27 × 70 = 1960/1890 - Add the two like fractions:
2430/1890 + 1960/1890 = 2430 + 1960/1890 = 4390/1890 - 4390/1890 simplified gives 439/189
- So, 90/70 + 28/27 = 439/189
In mixed form: 261/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/70+56/27 90/70+28/54 90/70+84/27 90/70+28/81