Across
1
Value that does not change
5
Result of multiplication
6
The number representing nothing
8
Collection of distinct elements
9
Total distance around a shape
10
Sum divided by count
11
Closed shape with straight sides
Down
1
Round shape with all points equidistant
2
Repeated addition
3
Difference between highest and lowest values
4
Power to which a number is raised
7
Symbol representing unknown value