Which fraction can be replaced with 0 when estimating with fractions? A. 1/5
B. 3/4
C. 8/20
D. 4/9

Any number as the denominator and 0 as the numerator can be replaced in the place of 0.

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.

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