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To type a decimal point, you use the period key. .
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 may or may not contain a fractional part. If not, the decimal representation does not require a decimal point.
You round the fractions to decimal numbers to a suitable number of decimal digits. Then create a stem and leaf plot using these numbers - ignoring the decimal point, except that you must make sure you mention it in the key.
No, the sum of a repeating decimal and a terminating decimal is never a terminating decimal.
If you don't have a calulator with the percent key, then use a decimal number. Example being 4% would then be .04, or 10% would be .10.