Across
1
Reference line in a graph
4
Number with digits after a point
5
Number divisible only by 1 and itself
6
The number representing nothing
11
Part of a line with two endpoints
Down
2
Total distance around a shape
3
Number that divides evenly into another
7
Symbol representing unknown value
8
Math using letters for unknown values
9
Result of addition
10
Divisible by two