Subtract 28/7 from 3/30, Solve 3/30

Subtract 28/7 from 3/30

1^st number: 3/30, 2^nd number: 4 0/7

3/30 - 28/7 is -39/10.

Find the least common denominator or LCM of the two denominators:
LCM of 30 and 7 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 30 × 7 = 210,
3/30 = 3 × 7/30 × 7 = 21/210
Likewise, for the 2nd fraction, since 7 × 30 = 210,
28/7 = 28 × 30/7 × 30 = 840/210
Subtract the two like fractions:
21/210 - 840/210 = 21 - 840/210 = -819/210
After reducing the fraction, the answer is -39/10

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