Solutions by everydaycalculation.com

2021 is greater than 645

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

LCM of 21 and 45 is**315**

Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 21 × 15 = 315,

2021 = 20 × 1521 × 15 = 300315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,

645 = 6 × 745 × 7 = 42315 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 300315 > 42315 or 2021 > 645

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