Add 21/30 and 70/63
1st number: 21/30, 2nd number: 1 7/63
21/30 + 70/63 is 163/90.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 63 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 30 × 21 = 630,
21/30 = 21 × 21/30 × 21 = 441/630 - Likewise, for the 2nd fraction, since 63 × 10 = 630,
70/63 = 70 × 10/63 × 10 = 700/630 - Add the two like fractions:
441/630 + 700/630 = 441 + 700/630 = 1141/630 - 1141/630 simplified gives 163/90
- So, 21/30 + 70/63 = 163/90
In mixed form: 173/90
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