Across
1
Space between two intersecting lines
3
Value that does not change
4
The number representing nothing
8
Round shape with all points equidistant
9
Split into equal parts
10
Number that divides evenly into another
11
Single numeral from 0 to 9
Down
1
Reference line in a graph
2
Difference between highest and lowest values
5
Parts per hundred
6
Symbol representing unknown value
7
Divisible by two
12
Proven mathematical statement