you will always have an odd number when you subtract an odd number from am even number
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No - adding an odd quantity of odd numbers will always result in an odd number.
The number 61 is an odd number. When divided by two, the result is 30.5
Yes - while multiplying odd numbers by even numbers will always produce an even result.
yes, the product of 2 odd numbers is always an odd number. Well, the question is why. The first number is "even" + 1. Multiply both of these by your odd number. Now the "even" times "odd" is even, because every "1" in the odd number becomes a "2". And then the remaining 1 times "odd" must be odd, which is an even +1. Add it all up and you get evens everywhere except that final "1". So the result is even + 1 which is odd. There is a quicker way if you know how to multiply bracketed terms: odd x odd = (even + 1)x(even +1)= even x even +even +even +1 = must be odd.