Subtract 28/8 from 84/18, Solve 4 12/18

Subtract 28/8 from 84/18

1^st number: 4 12/18, 2^nd number: 3 4/8

84/18 - 28/8 is 7/6.

Find the least common denominator or LCM of the two denominators:
LCM of 18 and 8 is 72

Next, find the equivalent fraction of both fractional numbers with denominator 72
For the 1st fraction, since 18 × 4 = 72,
84/18 = 84 × 4/18 × 4 = 336/72
Likewise, for the 2nd fraction, since 8 × 9 = 72,
28/8 = 28 × 9/8 × 9 = 252/72
Subtract the two like fractions:
336/72 - 252/72 = 336 - 252/72 = 84/72
After reducing the fraction, the answer is 7/6
In mixed form: 11/6

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