Other Number Classifications
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1
2OTHER NUMBER CLASSIFICATIONS
PRAXIS FLASHCARD #313
P
S
(
)
ERFECT
QUARES
NUMBERS
Numbers that have a whole number square root. The first ten perfect squares are 1, 4, 9, 16, 25, 36, 49, 64, 81, and 100.
Is zero a perfect square? There is a debate about this in the mathematics community – some believe zero is a perfect square
because 0 times 0 = 0; some disagree because they say the definition of a perfect square is “numbers that have a POSITIVE
integer square root” and zero is not positive. ….and the debate continues.
PRAXIS FLASHCARD #1
F
10 S
N
IRST
QUARE
UMBERS
1, 4, 9, 16, 25, 36, 49, 64, 81, 100
PRAXIS FLASHCARD #2
F
10 C
N
IRST
UBED
UMBERS
1, 8, 27, 64, 125, 216, 343, 512, 729, 1000
PRAXIS FLASHCARD #14
P
N
RIME
UMBERS
Prime Numbers = Integers greater than 1 with exactly 2 factors or divisors; numbers that are evenly divisible by only 1 and
themselves.
The number 2 is the first prime and it is the only even number that is prime. The number 1 is neither prime nor composite.
Memorize the prime numbers 1-100:
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97
PRAXIS FLASHCARD #281
S
E
IEVE OF
RATOSTHENES
The Sieve of Eratosthenes is a technique to teach young children about prime numbers. A paper is numbered from 2-100.
Circle 2 because it is prime. Then count every 2 numbers and cross them off (cross off the multiples of 2). The next number
after 2 that is not crossed off is 3, circle it. Count every 3 numbers (multiples of 3) and cross them off. The next number
after 3 that is not crossed off is 5, circle it. Count the multiples of 5 and cross them off…. This process continues for the
entire chart. All crossed-off numbers are composite; the prime numbers are circled.
PRAXIS FLASHCARD #15
C
N
OMPOSITE
UMBERS
Composite Numbers are numbers that have more than two factors or divisors; numbers that are not prime.
All whole numbers except for 1 and 0 are either prime or composite.
PRAXIS FLASHCARD #33
O
. E
N
DD VS
VEN
UMBERS
An even number is an integer that is evenly divisible by 2 (without a remainder). Note that the number zero is an even
number. An odd number is an integer that is NOT evenly divisible by 2.
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