Across
1
Parts per hundred
4
Mathematical rule or equation
5
Part of a line with two endpoints
9
Collection of distinct elements
10
Divisible by two
11
Closed shape with straight sides
12
Symbol representing unknown value
Down
2
Mathematical statement of equality
3
Repeated addition
6
Total distance around a shape
7
Number with digits after a point
8
Number divisible only by 1 and itself
13
Part of a whole number