Across
1
Difference between highest and lowest values
5
The number representing nothing
7
Line touching circle at one point
8
Number greater than zero
9
U-shaped curve of a quadratic function
11
System of ordered marks for measuring
Down
2
Mathematical rule or equation
3
Space between two intersecting lines
4
Steepness of a line
6
Number less than zero
10
Number with digits after a point
12
Parts per hundred