Add 21/45 and 8/70
21/45 + 8/70 is 61/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 70 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 45 × 14 = 630,
21/45 = 21 × 14/45 × 14 = 294/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
8/70 = 8 × 9/70 × 9 = 72/630 - Add the two like fractions:
294/630 + 72/630 = 294 + 72/630 = 366/630 - 366/630 simplified gives 61/105
- So, 21/45 + 8/70 = 61/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/45+8/70 21/45+16/70 21/90+8/70 63/45+8/70 21/45+24/70 21/45+40/70 21/45+56/70