8 metar (whatever that is) is 8 metar. There is no need for a decimal point when you have a whole number.
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Yes. 8.0 is greater than 0.80 Because, since 8 (from the 8.0) is before the lower decimal point, than it proves that the '8' is a whole number. But, since the 8 (from the 0.8) is after the decimal point, than it much smaller.
The number 8 wholes and 79 hundredths is 8.79 as a decimal. The whole number goes before the decimal point. Hundredths means two spaces after the decimal point.
The power of 10 is -8 so move the decimal point 8 digits to the left, inserting zeros when necessary: 8.61 × 10⁻⁸ = 0.0000000861
0.8 repeating is already a decimal, though as a repeating decimal it is usually written as 0.888... or 0.8 with a bar over the 8 signifiying that the 8 is the part of the decimal that repeats. ========================== It's a decimal point followed by an infinite number of 8s, and is equal to 8/9.
Type the fractional part in a calculator, as a division: 17 / 20. This will give you a decimal, zero point something; add this to 8.