Across
1
Parts per hundred
3
Mathematical rule or equation
8
Math using letters for unknown values
10
Number divisible only by 1 and itself
11
Rectangular array of numbers
12
Part of a circle's circumference
13
System of ordered marks for measuring
Down
2
Value that does not change
4
Steepness of a line
5
Lines that never intersect
6
Sum divided by count
7
Line touching circle at one point
9
Number that divides evenly into another