Across
1
U-shaped curve of a quadratic function
4
Repeated addition
5
Number less than zero
6
Line crossing from corner to corner
7
Difference between highest and lowest values
8
Line segment connecting two circle points
12
Closed shape with straight sides
Down
1
Number divisible only by 1 and itself
2
Result of multiplication
3
Lines that never intersect
6
Single numeral from 0 to 9
9
Power to which a number is raised
10
Math using letters for unknown values
11
Total distance around a shape
13
Value that does not change