Across
1
The number representing nothing
3
Value that does not change
4
Rectangular array of numbers
6
Number divisible only by 1 and itself
7
Closed shape with straight sides
8
Comparison of two quantities
9
Part of a circle's circumference
Down
2
Number that divides evenly into another
5
Part of a whole number
6
Parts per hundred
9
Reference line in a graph