Across
1
Number greater than zero
5
Power to which a number is raised
6
Line touching circle at one point
7
Symbol representing unknown value
10
Number divisible only by 1 and itself
Down
2
Repeated addition
3
Rectangular array of numbers
4
The number representing nothing
8
U-shaped curve of a quadratic function
9
Lines that never intersect
11
Single numeral from 0 to 9