You should use the relationship of 10 decimeters equal 1 meter. So if you have 4 meters could convert them into 40 decimeters.
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To change meters to decimeters, you should multiply the number of meters by 10, as there are 10 decimeters in one meter.
Liter is a specific unit; the question should be, "metric units for volume". Volume is measured in cubic meters; for larger volumes you might use square kilometers; for smaller volumes, such as those that occur in everyday situations, you would usually use cubic decimeters (= liters), cubic centimeters (= milliliters), or cubic millimeters.
In a standard calculation it would be the exponent, also known as the power of. However, the use of brackets can change the order of operations and so sometimes another operation could be done first. Exponents should be processed first, then multiplication and division, then addition and subtraction. The use of parenthesis brackets can be used to override this default precedence order.
One kilometer equals 1000 meters.
There shouldn't be any units as what you are essentially asking is 'How many times does 2 meters go into 4 meters?' and the answer is simply twice, or 2.
Multiplication.