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Whole Numbers are simply the numbers 0, 1, 2, 3, 4, 5, …(and so on)
Non-integers are fractions, decimal numbers, and irrational numbers. Integers are positive and negative whole numbers.
They both exclude fractions and irrational numbers. Natural numbers are a subset of whole numbers (also called integers); Natural numbers are any positive whole number (meaning any whole number 1 or greater). Whole numbers, also called integers, can be zero or negative.
An even number is a number which can be divisible by 2 and remain whole number (not a fraction or decimal). Odd numbers are basically everything else (number that cannot be divisible by 2). Even number examples: 2, 8, 64, 2018 Odd number examples: 1, 3, 19, 719
If you can subtract whole numbers you can subtract decimals. Forget about the decimal for a sec and subtract the numbers as if they were whole numbers. 2.5 -1.4 =1.1 hope this helps and if not yahoo usually has good examples.