Across
1
Comparison of two quantities
4
Math using letters for unknown values
5
Difference between highest and lowest values
6
Number divisible only by 1 and itself
8
The number representing nothing
10
Number with digits after a point
11
Part of a line with two endpoints
Down
2
Part of a circle's circumference
3
Reference line in a graph
6
Number greater than zero
7
Proven mathematical statement
9
Repeated addition
12
Symbol representing unknown value
13
Corner point of a polygon