$1 = 100 cents
→ 45 cents/$1 = 45 cents/100 cents = 45/100 = 9/20
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50 cents is 1/2 of a dollar (100 cents)
2 cents/1 dollar = 2 cents/100 cents = 2/100 = 1/50
Ten cents is 1/10 of a dollar. Twenty cents is 2/10 of a dollar, or 1/5 of a dollar. Twenty five cents is 2.5/10 of a dollar, or 1/4 of a dollar. and so on.
1/5
1/4