By leaving it alone because it is already a decimal
825.0
547.0
0.45
7.03
70
With great difficulty because decimal numbers weren't used by the Romans
547 multiplied by 547 is 299,209.
wirte two sentences about Jack underneath
No. 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. If it does not contain a fractional part then the decimal representation does not require a decimal point. So, for example, 547 is a decimal number as well as an integer.
547 - 450 = 97
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8,500,000