Solutions by everydaycalculation.com

3070 - 920 is -3140.

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

LCM of 70 and 20 is**140**

Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 70 × 2 = 140,

3070 = 30 × 270 × 2 = 60140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,

920 = 9 × 720 × 7 = 63140 - Subtract the two like fractions:

60140 - 63140 = 60 - 63140 = -3140

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