Across
1
Number less than zero
6
Line crossing from corner to corner
7
Repeated addition
8
Exact correspondence on both sides
10
Single numeral from 0 to 9
11
Rectangle with four equal sides
12
Comparison of two quantities
Down
2
Parts per hundred
3
The number representing nothing
4
Number that divides evenly into another
5
Part of a whole number
9
Reference line in a graph
13
Divisible by two