Across
1
Closed shape with straight sides
5
Result of addition
6
Comparison of two quantities
8
Divisible by two
11
Math using letters for unknown values
12
Lines that never intersect
Down
2
Sum divided by count
3
Repeated addition
4
Symbol representing unknown value
5
Steepness of a line
7
The number representing nothing
9
Difference between highest and lowest values
10
Power to which a number is raised