375/450 = 5/6
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375 x 1.2 = 450
1). Quick check: Any number that you can write down completely with digits is a rational number. So yes, it is. 2). Formal analysis: A rational number is a number that can be written as the ratio of two integers. 375 is the ratio of 375 to 1 ( 375/1 ) . So yes, it is.
4.5:0.75 = 450:75 = 6:1
20% of 375= 20% * 375= 0.2 * 375= 75
-375 = -375/1