Across
1
Proven mathematical statement
3
Reference line in a graph
7
Difference between highest and lowest values
8
Math using letters for unknown values
9
Rectangular array of numbers
10
Single numeral from 0 to 9
Down
2
Value that does not change
4
Mathematical rule or equation
5
Number with digits after a point
6
Rectangle with four equal sides
7
Comparison of two quantities
11
Exact correspondence on both sides