a cube that is equal to 1 unit....
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a unit of measure equal to half of a pint
It means Centimeter- it's a unit of measure, like on a ruler.
bar modeling is math
it is a unit.
for example 1/3 1/3 1/3 1/3 1/3 1/3 1/3 you have to count it which is 7 so thats the unit fraction also, unit fraction mean the number in all for the picture.