Across
1
Value that does not change
4
Lines that never intersect
5
Symbol representing unknown value
7
Power to which a number is raised
8
Total distance around a shape
9
Difference between highest and lowest values
14
Number with digits after a point
Down
2
Longest side of a right triangle
3
Rectangle with four equal sides
4
Parts per hundred
6
Part of a whole number
10
Line touching circle at one point
11
Single numeral from 0 to 9
12
Number less than zero
13
Rectangular array of numbers