Across
1
Reference line in a graph
4
Number greater than zero
5
Power to which a number is raised
9
System of ordered marks for measuring
11
Number divisible only by 1 and itself
Down
2
Rectangle with four equal sides
3
Symbol representing unknown value
6
Difference between highest and lowest values
7
Split into equal parts
8
Single numeral from 0 to 9
10
Longest side of a right triangle
12
Part of a line with two endpoints