Parts refers to a miscellaneous, fractional standard of measure.
For example, 1 part bleach to 10 parts water. If you wanted to make a lot, you might use gallons: 1 gallon of bleach with 10 gallons of water. If you wanted to make a little: 1 tablespoon of bleach to 10 tablespoons of water.
You pick the standard "part" size to get the quantity you need.
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a number and a unit
In metric measurement the prefix Kilo~ means one thousand.
A kilogram is a measurement unit for mass. There is no numerical aspect to it.
A mixed number is a number that contains both whole parts and fractions written like the example below: 2 1/2 which is 2 and a half (2.5)
There are 2 significant figures in this measurement.