It depends upon the base of the number, but it is always one less than the base.
For decimal numbers (base 10), our usual numbers, the largest digit that can be used in 10 - 1 = 9.
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A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. It does not relate directly to weight.
18.19
99 is the largest two digit number. If I can use the digits anyway I want, then 9 to the 9th power is larger
103 in decimal form is simply 103. Decimal form refers to the base-10 numbering system we commonly use, where each digit's place value is a power of 10. In this case, the digit 1 is in the hundreds place, the digit 0 is in the tens place, and the digit 3 is in the ones place.
44/22 = 2 so the decimal point should be placed after the first digit (which is a 1).