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How do you remember the measurement easily?

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If its the metric system, I use the following to remember the prefixes:

King Henry Drank My Delicious Chocolate Milk

Kilo, Hecto, Decka, middle, Deci, Centi, Milli

"middle" can be replaced by Meter, Liter, Gram.  Those ending in "i" are smaller than the unit measurement.  For example: km, hm, dkm, m, dm, cm, mm

This works well because moving to the right makes the numerical value bigger for smaller sized units, whereas, moving to the left makes the numerical value smaller for larger sized units.  So when you are changing units you can just count the direction of the movement.

For example:  1.5 cm = ? km.  Moving from cm to km is 5 to the left ==> move the decimal 5 to the left to change 1.5 to .000015.  Therefore, 1.5 cm = .000015 km.  km units are larger than cm, you need less of them to get the same measurement.

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If it is the English system:  I think dairy and the sizes of how they sell milk as well as baking -

Gallons, Half Gallons, Quarts, Pints, Cups, Ounces

The equality units would be:

1 Gallon = 2 Half Gallons [a half gallon is tall and 6" square]

1 Half Gallon = 2 Quarts [a quart is tall and about 4" square]

1 Quart = 2 Pints [a pint is short and 4" square - half a quart]

1 Pint = 2 cups [elementary school milk is sold in half pints which is 1 cup]

1 cup = 8 ounces

So 1 Gallon = 4 Quarts = 8 Pints = 16 cups = 128 ounces

I have seen this drawn as "Gallon Man"  and you can see what he looks like using a search engine.