Across
1
Result of addition
3
Middle value in an ordered dataset
4
Parts per hundred
6
Symbol representing unknown value
7
Proven mathematical statement
Down
1
System of ordered marks for measuring
2
Number with digits after a point
4
Number divisible only by 1 and itself
5
U-shaped curve of a quadratic function
8
Round shape with all points equidistant
9
Number that divides evenly into another