Across
1
Repeated addition
5
The number representing nothing
6
Rectangular array of numbers
7
Visual representation of data
9
Divisible by two
11
Single numeral from 0 to 9
12
Math using letters for unknown values
Down
2
Parts per hundred
3
Exact correspondence on both sides
4
Symbol representing unknown value
8
Part of a line with two endpoints
10
Number with digits after a point