Solutions by everydaycalculation.com

1^{st} number: 3 7/21, 2^{nd} number: 1/7

7021 - 17 is 6721.

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

LCM of 21 and 7 is**21**

Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 21 × 1 = 21,

7021 = 70 × 121 × 1 = 7021 - Likewise, for the 2nd fraction, since 7 × 3 = 21,

17 = 1 × 37 × 3 = 321 - Subtract the two like fractions:

7021 - 321 = 70 - 321 = 6721 - In mixed form: 3421

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