Add 9/70 and 80/90
9/70 + 80/90 is 641/630.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 70 × 9 = 630,
9/70 = 9 × 9/70 × 9 = 81/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
80/90 = 80 × 7/90 × 7 = 560/630 - Add the two like fractions:
81/630 + 560/630 = 81 + 560/630 = 641/630 - So, 9/70 + 80/90 = 641/630
In mixed form: 111/630
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