Across
1
Value that does not change
4
Mathematical rule or equation
7
Amount of space an object occupies
9
Single numeral from 0 to 9
10
Comparison of two quantities
12
Difference between highest and lowest values
Down
2
Lines that never intersect
3
Parts per hundred
5
Rectangular array of numbers
6
Part of a circle's circumference
8
Result of addition
11
Middle value in an ordered dataset
13
Line touching circle at one point