Add 54/70 and 18/80
54/70 + 18/80 is 279/280.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 80 is 560
Next, find the equivalent fraction of both fractional numbers with denominator 560 - For the 1st fraction, since 70 × 8 = 560,
54/70 = 54 × 8/70 × 8 = 432/560 - Likewise, for the 2nd fraction, since 80 × 7 = 560,
18/80 = 18 × 7/80 × 7 = 126/560 - Add the two like fractions:
432/560 + 126/560 = 432 + 126/560 = 558/560 - 558/560 simplified gives 279/280
- So, 54/70 + 18/80 = 279/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/70+36/80 54/70+54/80 54/70+90/80