SparkNotes: Old SAT: Odd and Even Numbers

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Please Note:
The last administration of the old SAT was on 1/22/05. Beginning 3/12/05, only the New SAT will be administered. You should be studying the New SAT book. Go there!

10.1	Order of Operations

10.2	Odd and Even Numbers

10.3	Signed Numbers

10.4	Divisibility and Remainders

10.5	Multiples, Factors, and Primes

10.6	Fractions, Decimals, and Percents

10.7	Ratios

10.8	Rates

10.9	Arithmetic Mean, Median, and Mode

10.10	Exponents

10.11	Probability

10.12	Series

10.13	Sets

Odd and Even Numbers

Again, you should already know about odd and even numbers and the difference between them. For this topic, however, we will provide a very quick review.

Even Numbers

Even numbers are numbers that are divisible by 2 with no remainder. Remember that 0 is included within this definition.

. . . , –6, –4, –2, 0, 2, 4, 6, . . .

Odd Numbers

Odd numbers are numbers that, when divided by 2, will leave a remainder of 1.

. . . , –5, –3, –1, 1, 3, 5, . . .

Operations and Odd and Even Numbers

There are a number of rules regarding operations and odd and even numbers that you should know instinctively.

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

When the SAT tests your knowledge of odd and even numbers, which happens about once or twice a test, it will usually test your knowledge of these rules.

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