Across
1
Number that divides evenly into another
3
System of ordered marks for measuring
4
Total distance around a shape
5
Math using letters for unknown values
6
Steepness of a line
Down
2
Line crossing from corner to corner
3
Collection of distinct elements
4
U-shaped curve of a quadratic function
7
Result of multiplication
8
Number with digits after a point
9
Number less than zero