Subtract 63/42 from 16/45, Solve 16/45

Subtract 63/42 from 16/45

1^st number: 16/45, 2^nd number: 1 21/42

16/45 - 63/42 is -103/90.

Find the least common denominator or LCM of the two denominators:
LCM of 45 and 42 is 630

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 45 × 14 = 630,
16/45 = 16 × 14/45 × 14 = 224/630
Likewise, for the 2nd fraction, since 42 × 15 = 630,
63/42 = 63 × 15/42 × 15 = 945/630
Subtract the two like fractions:
224/630 - 945/630 = 224 - 945/630 = -721/630
After reducing the fraction, the answer is -103/90

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