Add 7/10 and 9/21
7/10 + 9/21 is 79/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 10 × 21 = 210,
7/10 = 7 × 21/10 × 21 = 147/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
9/21 = 9 × 10/21 × 10 = 90/210 - Add the two like fractions:
147/210 + 90/210 = 147 + 90/210 = 237/210 - 237/210 simplified gives 79/70
- So, 7/10 + 9/21 = 79/70
In mixed form: 19/70
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