Across
1
Divisible by two
4
Number that divides evenly into another
5
Symbol representing unknown value
6
Amount of space an object occupies
7
Number with digits after a point
8
Comparison of two quantities
10
Collection of distinct elements
11
The number representing nothing
12
Number less than zero
13
U-shaped curve of a quadratic function
Down
2
Number greater than zero
3
Mathematical statement of equality
9
Sum divided by count