Subtract 45/10 from 28/42, Solve 28/42

Subtract 45/10 from 28/42

1^st number: 28/42, 2^nd number: 4 5/10

28/42 - 45/10 is -23/6.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 10 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 42 × 5 = 210,
28/42 = 28 × 5/42 × 5 = 140/210
Likewise, for the 2nd fraction, since 10 × 21 = 210,
45/10 = 45 × 21/10 × 21 = 945/210
Subtract the two like fractions:
140/210 - 945/210 = 140 - 945/210 = -805/210
After reducing the fraction, the answer is -23/6

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