how do we know if a number is even?
I know that if a number is even then whenever it is divided by 2, the results wont be a decimal number. But is there any other way to defini this?
2006-09-14 11:41:08 · 5 answers · asked by ? 1 in Science & Mathematics ➔ Mathematics
A quicker way to define even numbers is to say that when the number is divided by two, the result is a whole number. Even numbers always end with 0, 2, 4, 6, and 8, and numbers ending with these digits are always even.
2006-09-14 11:43:20 · answer #1 · answered by DavidK93 7 · 2⤊ 0⤋
1/ Binary
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If you write an even number in Binary the rigth most digit will be a ZERO
Example: 12 in decimal -> 1100 in binary
2/ Equation
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For each even number X the is exactly on REAL Y so that 2*Y=X
(such number Y does not exists fore odd numbers)
3/ Writing it in decimal
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If the last digit is 2,4,6,8,or 0 then the number is even otherwise it is odd
2006-09-14 11:48:14 · answer #2 · answered by cd4017 4 · 0⤊ 0⤋
well actually thats pretty much it if it can be divide equally without being a decimal its even or like my teacher taught me each finger should have a partner
2006-09-14 11:45:21 · answer #3 · answered by cleanheart 5 · 0⤊ 0⤋
2 is prime and it is even.
2006-09-14 11:44:46 · answer #4 · answered by Glenn N 5 · 1⤊ 0⤋
even numbers are never prime
2006-09-14 11:43:31 · answer #5 · answered by pistonfan1111 1 · 0⤊ 4⤋