Across
1
Reference line in a graph
4
Steepness of a line
5
Repeated addition
9
Three-sided polygon
10
Mathematical rule or equation
Down
2
Difference between highest and lowest values
3
Line crossing from corner to corner
4
Result of addition
6
Comparison of two quantities
7
Number with digits after a point
8
Symbol representing unknown value
11
Single numeral from 0 to 9