Natural numbers are:
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Yes, because naturals are counting numbers, {1,2,3...} and any natural number added by another natural number has to be a natural. Think of a number line, and your adding the natural numbers. The sum has to be natural, so yes it is closed.
All natural numbers are rational numbers. No irrational numbers are natural numbers.
positive integers leaves out important numbers like e, pi, sqrt(2) and 3/4. Another name for positive numbers would be 'numbers greater than zero'. another would be even numbers on the number line downerlokz AHM HS lol
Natural numbers extend from 1 to positive infinity.Real numbers are all numbers between negative infinity and positive infinity.ALL natural numbers are real numbers, but NOT ALLreal numbers are natural numbers.
All natural numbers are integers, not all integers are natural numbers.