345 or 345.0
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Yes, 345 is an integer or a whole number because it has not got any fractions or decimals with it.
To write out fifty hundredths in decimals, you would write it as 0.50
Decimals are numbers.
As a decimal: 345.0 As an improper fraction: 345/1 In scientific notation: 3.45*10^2
345 is a whole number already so just write that.