It is ONE lot of whatever it is.
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A unit rate is the rate or price for one of something that is normally available in dozens, hundreds, gross lots, thousands, crates, truckloads, etc.
Any metric unit would do. But it might be easier to pick something smaller than the length of the pencil, like a centimeter, or a millimeter.
The unit rate is how far something moves in ONE second. So in this case you divide by 28 (the number of seconds). 12/28=0.4285714285714286 meters a second.
The unit ratio for quarters (one-fourth of something) is 4:1Since there are 4 quarters to 1 of whatever you want to refer to, that means for a unit of 1 million, there are 4 million quarters.
A non-unit fraction is a fraction that has something other than a 1 in the numerator.