Across
1
Difference between highest and lowest values
5
Math using letters for unknown values
6
Middle value in an ordered dataset
7
System of ordered marks for measuring
10
Mathematical statement of equality
12
Reference line in a graph
Down
2
Sum divided by count
3
Closed shape with straight sides
4
Symbol representing unknown value
8
Rectangular array of numbers
9
Split into equal parts
11
Number with digits after a point