Across
1
Value that does not change
5
Number divisible only by 1 and itself
8
Three-sided polygon
9
Rectangle with four equal sides
Down
2
Result of addition
3
Number with digits after a point
4
Result of multiplication
6
Reference line in a graph
7
Part of a line with two endpoints
10
Middle value in an ordered dataset
11
Mathematical rule or equation
12
Steepness of a line
13
Difference between highest and lowest values