Across
1
Number with digits after a point
2
Steepness of a line
5
Number greater than zero
6
The number representing nothing
7
Value that does not change
8
Space between two intersecting lines
12
Repeated addition
Down
1
Single numeral from 0 to 9
2
Result of addition
3
Parts per hundred
4
Math using letters for unknown values
9
Proven mathematical statement
10
Split into equal parts
11
Comparison of two quantities
13
Line touching circle at one point