Solutions by everydaycalculation.com

542 - 920 is -139420.

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

LCM of 42 and 20 is**420** - For the 1st fraction, since 42 × 10 = 420,

542 = 5 × 1042 × 10 = 50420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,

920 = 9 × 2120 × 21 = 189420 - Subtract the two fractions:

50420 - 189420 = 50 - 189420 = -139420

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