Across
1
Corner point of a polygon
4
Closed shape with straight sides
6
The number representing nothing
8
System of ordered marks for measuring
9
Number that divides evenly into another
10
Rectangle with four equal sides
Down
2
Number greater than zero
3
Exact correspondence on both sides
4
Number divisible only by 1 and itself
5
Line crossing from corner to corner
7
Proven mathematical statement
11
Comparison of two quantities
12
Parts per hundred