Across
1
Repeated addition
4
Part of a whole number
5
Number less than zero
6
Symbol representing unknown value
9
Rectangle with four equal sides
Down
2
Line touching circle at one point
3
Power to which a number is raised
7
Lines that never intersect
8
Exact correspondence on both sides
10
Number that divides evenly into another
11
The number representing nothing
12
Proven mathematical statement