Across
1
Rectangular array of numbers
4
Collection of distinct elements
5
Closed shape with straight sides
6
Lines that never intersect
8
Single numeral from 0 to 9
9
Difference between highest and lowest values
Down
1
Middle value in an ordered dataset
2
Number that divides evenly into another
3
Mathematical statement of equality
7
The number representing nothing
10
Line crossing from corner to corner
11
Divisible by two