Solutions by everydaycalculation.com

640 is smaller than 2150

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

LCM of 40 and 50 is**200**

Next, find the equivalent fraction of both fractional numbers with denominator 200 - For the 1st fraction, since 40 × 5 = 200,

640 = 6 × 540 × 5 = 30200 - Likewise, for the 2nd fraction, since 50 × 4 = 200,

2150 = 21 × 450 × 4 = 84200 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 30200 < 84200 or 640 < 2150

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