Add 21/30 and 25/70
21/30 + 25/70 is 37/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
21/30 = 21 × 7/30 × 7 = 147/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
25/70 = 25 × 3/70 × 3 = 75/210 - Add the two like fractions:
147/210 + 75/210 = 147 + 75/210 = 222/210 - 222/210 simplified gives 37/35
- So, 21/30 + 25/70 = 37/35
In mixed form: 12/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30+25/70 21/30+50/70 21/60+25/70 63/30+25/70 21/30+75/70 21/90+25/70