Across
1
Single numeral from 0 to 9
4
Rectangular array of numbers
5
Closed shape with straight sides
9
Result of raising a number to an exponent
10
Number greater than zero
11
The number representing nothing
Down
2
Middle value in an ordered dataset
3
Line crossing from corner to corner
4
Repeated addition
6
Mathematical statement of equality
7
Number less than zero
8
Difference between highest and lowest values