Solutions by everydaycalculation.com

1090 - 2770 is -173630.

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

LCM of 90 and 70 is**630**

Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,

1090 = 10 × 790 × 7 = 70630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,

2770 = 27 × 970 × 9 = 243630 - Subtract the two like fractions:

70630 - 243630 = 70 - 243630 = -173630

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