Across
1
Symbol representing unknown value
3
Total distance around a shape
5
System of ordered marks for measuring
6
Value that does not change
7
Result of addition
13
Result of multiplication
Down
2
Line crossing from corner to corner
3
Closed shape with straight sides
4
Mathematical rule or equation
8
Visual representation of data
9
Three-sided polygon
10
Distance from center to edge of circle
11
Single numeral from 0 to 9
12
Repeated addition