
Front cards 
Back cards 
1 
Area of a Circle 
Pie R Squared 
2 
Area of a Rectangle 
Length times width 
3 
Area of a Square 
Side squared 
4 
Area of a Triangle 
Half the base, times the height 
5 
Average 
Sum of Terms, over, the Number of Terms 
6 
Circumference 
2 pie R 
7 
Common denominator 
A denominator that is the same in two or more fractions 
8 
Composite number 
an integer that is greater than one that is not prime 
9 
Denominator 
The bottom number of a fraction. 
10 
Diameter 
2 times the radius; 2R 
11 
Divisible 
A number is divisible by its factors; 60 is divisible by 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, and 60 
12 
Divisor 
Integers that may be multiplied to produce a number; numbers that an integer is divisible by; e.g. all divisors for 60 are 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, and 60 
13 
Equilateral triangle 
60; 60; 60 
14 
Even integer 
An integer that is divisible by 2 
15 
Factor 
Integers that may be multiplied to produce a number; numbers that an integer is divisible by; e.g. all factors for 60 are 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, and 60 
16 
Fraction 
Is a number of the form a/b , where a and b are integers and b ≠ 0 
17 
Greatest common divisor 
The largest factor that two or more numbers have in common 
18 
integers 
the set of positive whole numbers and their opposites (negative numbers) and 0 
19 
Interger 
A positive or negative number 
20 
Invert 
The reciprocal of a fraction (turn 3/4 into 4/3) 
21 
least common multiple 
the smallest multiple that is exactly divisible by every member of a set of numbers 
22 
Median 
The middle term of a set in sequential order 
23 
mixed number 
a whole number , a whole number and a fractional part 
24 
Mode 
The term that occurs most frequently 
25 
Multiple 
The product created by a numbers factors; 25 is a multiple of 25, 5, 1, 1, 5, and 25 
26 
numerator 
the top number of a fraction 
27 
Odd integer 
An integer that is not divisible by 2 
28 
Prime divisors 
A list of prime numbers that produce by multiplication some number; the prime divisors for 12 are 2, 2, and 3 because 2 * 2 * 3 = 12 
29 
Prime factorization 
a list of the prime divisors 
30 
Prime number 
Natural number greater than 1 that has no positive divisor other than 1 and itself; 
31 
Probability 
The likelihood of an event occurring; 
32 
Pythagorean Triplets 
3, 4, 5; 
33 
Quotient 
The integer obtained by division (always has a remainder even if that remainder is 0; 19 ÷ 7 = quotient 2 with a remainder of 5) 
34 
Range 
The difference between the greatest term and the least term 
35 
Rational numbers 
Any number that can be expressed as a fraction 
36 
Reciprocal 
The inverse of a fraction (3/4 becomes 4/3) 
37 
Remainder 
The remaining number after division (19 ÷ 7 = 2 with a remainder of 5) 
38 
Right Triangle  30, 60, 90 
X; X Square root of 3; 2X 
39 
Right Triangle  45, 45, 90 
X; X; X Square root of 2 