Add 42/90 and 21/70
42/90 + 21/70 is 23/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 70 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
42/90 = 42 × 7/90 × 7 = 294/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
21/70 = 21 × 9/70 × 9 = 189/630 - Add the two like fractions:
294/630 + 189/630 = 294 + 189/630 = 483/630 - 483/630 simplified gives 23/30
- So, 42/90 + 21/70 = 23/30
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