Solutions by everydaycalculation.com

640 is greater than 790

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

LCM of 40 and 90 is**360**

Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 40 × 9 = 360,

640 = 6 × 940 × 9 = 54360 - Likewise, for the 2nd fraction, since 90 × 4 = 360,

790 = 7 × 490 × 4 = 28360 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 54360 > 28360 or 640 > 790

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