Across
1
Exact correspondence on both sides
3
Parts per hundred
4
Number less than zero
10
The number representing nothing
11
Repeated addition
Down
2
Result of raising a number to an exponent
3
Lines that never intersect
5
Split into equal parts
6
Part of a whole number
7
Reference line in a graph
8
Number with digits after a point
9
Steepness of a line
12
Line touching circle at one point
13
Space between two intersecting lines