Across
1
Repeated addition
4
Steepness of a line
5
System of ordered marks for measuring
7
Closed shape with straight sides
8
Math using letters for unknown values
9
Line touching circle at one point
Down
2
Part of a whole number
3
Line crossing from corner to corner
4
Rectangle with four equal sides
6
Longest side of a right triangle
10
Symbol representing unknown value
11
Sum divided by count
12
Difference between highest and lowest values