A number without a decimal would be a number without a fraction - hence it would be a "whole number".
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0.10, to the nearest whole number - ie without a decimal - is zero.
thousandths
Only as an approximation. An irrational number is equivalent to a non-terminating, non-recurring decimal. That is, an infinitely long decimal number without any repeating pattern.
Yes. A whole number is a number without a decimal. Hope this helps!
Yes. Any number without a fraction, decimal, or negative sign is a whole number.