Across
1
Difference between highest and lowest values
2
System of ordered marks for measuring
6
Line crossing from corner to corner
10
The number representing nothing
11
Repeated addition
12
Comparison of two quantities
Down
2
Collection of distinct elements
3
Symbol representing unknown value
4
Line touching circle at one point
5
Mathematical statement of equality
7
Space between two intersecting lines
8
Total distance around a shape
9
Proven mathematical statement