Across
1
Single numeral from 0 to 9
3
Mathematical rule or equation
5
Result of multiplication
7
Rectangular array of numbers
9
Rectangle with four equal sides
11
Exact correspondence on both sides
12
Symbol representing unknown value
Down
1
Number with digits after a point
2
Difference between highest and lowest values
4
Part of a circle's circumference
6
Distance from center to edge of circle
8
Number that divides evenly into another
9
Result of addition
10
Power to which a number is raised