Across
1
Part of a whole number
5
Number greater than zero
6
The number representing nothing
7
Proven mathematical statement
8
Divisible by two
10
System of ordered marks for measuring
12
Math using letters for unknown values
13
Number with digits after a point
Down
2
Value that does not change
3
Reference line in a graph
4
Longest side of a right triangle
9
Split into equal parts
11
U-shaped curve of a quadratic function