Across
1
Rectangular array of numbers
3
The number representing nothing
7
Difference between highest and lowest values
8
Mathematical statement of equality
10
Line crossing from corner to corner
11
Parts per hundred
12
Repeated addition
Down
2
Round shape with all points equidistant
4
Mathematical rule or equation
5
Corner point of a polygon
6
Comparison of two quantities
9
Rectangle with four equal sides