Across
1
Value that does not change
4
Number divisible only by 1 and itself
5
Math using letters for unknown values
8
Difference between highest and lowest values
9
Repeated addition
Down
2
Steepness of a line
3
Sum divided by count
6
Line touching circle at one point
7
Rectangular array of numbers
10
Closed shape with straight sides
11
Collection of distinct elements