Across
1
Closed shape with straight sides
5
Single numeral from 0 to 9
7
Comparison of two quantities
8
Middle value in an ordered dataset
Down
2
Round shape with all points equidistant
3
Line touching circle at one point
4
Repeated addition
6
Symbol representing unknown value
7
Difference between highest and lowest values
9
The number representing nothing
10
Number less than zero
11
Power to which a number is raised