Solutions by everydaycalculation.com

1^{st} number: 21/28, 2^{nd} number: 4 10/15

2128 - 7015 is -4712.

- Find the least common denominator or LCM of the two denominators:

LCM of 28 and 15 is**420**

Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 28 × 15 = 420,

2128 = 21 × 1528 × 15 = 315420 - Likewise, for the 2nd fraction, since 15 × 28 = 420,

7015 = 70 × 2815 × 28 = 1960420 - Subtract the two like fractions:

315420 - 1960420 = 315 - 1960420 = -1645420 - After reducing the fraction, the answer is -4712

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