Across
1
Comparison of two quantities
3
Difference between highest and lowest values
6
Math using letters for unknown values
7
Space between two intersecting lines
12
Round shape with all points equidistant
13
Exact correspondence on both sides
Down
2
Parts per hundred
4
Symbol representing unknown value
5
The number representing nothing
8
Distance from center to edge of circle
9
Mathematical rule or equation
10
Middle value in an ordered dataset
11
Total distance around a shape