a place value is for example the number is 1598 what is the place value in tens place is 90
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The base, which, in everyday use is 10.
The laws of exponents work the same with rational exponents, the difference being they use fractions not integers.
A carpenter won't usually have much use for exponents, or other advanced math topics.
You use place value for all decimal numbers that contain fractional parts. You also use place value for all decimal integers other than those containing only one-digit.
It is: 2*5*7 = 70 and no exponents are needed