Numbers & Operations
Odd and Even Numbers
Even numbers are numbers that divide by 2 without leaving a remainder. Odd numbers are the numbers that, when divided by 2, leave a remainder of 1. The only number that might cause you to scratch your head is zero. It turns out that zero is, in fact, even.
So zero is the only number that has a strange property in terms of odd and even. How often do you think zero just happens to appear on the SAT?
Operations and Odd and Even Numbers
Now that you’ve been introduced to odd and even numbers, it’s time to get down to business. You have to know how to add, subtract, multiply, and divide odd and even numbers:
Addition Subtraction Multiplication
even + even = even even – even = even eveneven = even
odd + odd = even odd – odd = even oddodd = odd
even + odd = odd even – odd = odd evenodd = even
odd +even = odd odd – even = oddd oddeven = even
Knowing these general rules makes it easier for you to eliminate answer choices on multiple-choice items. If you know your answer needs to be an odd number, for instance, you should be able to eliminate all the even-numbered answer choices.
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