Because we are using the decimal system which has a base of 10.
This means that there are ten digits (0 to 9) from which all other numbers can be represented. It also means that each digit in a number represents a multiple of a power of 10 which increases by one as you move left. For instance, the number 123 means (3 x 100) + (2 x 101) + (1 x 102).
Once we pass the numbers that we can represent as a multiple of 100 we have to introduce another digit to continue.
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The first number must be a nonzero single-digit integer. The exponent must be an integer.
Zero is in the first decimal place of 98. An integer does not have any decimals, however, can be represented with decimals by placing first a decimal point ("dot") after the number and as many zeros as one wishes thereafter. For example, 98 is equal to the following values: (a) 98 (b) 98.0 (c) 98.00 (d) 98.00000000000000 Because the first decimal position is the first one to the right of the decimal point (as represented by examples b, c and d, above), the value is zero.
Divide the smaller number into the bigger one. If the result is an integer, the first number is a factor of the second one.
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