Across
1
Parts per hundred
4
Symbol representing unknown value
6
Repeated addition
8
Steepness of a line
11
Rectangle with four equal sides
12
Single numeral from 0 to 9
Down
2
Split into equal parts
3
Longest side of a right triangle
5
Three-sided polygon
7
Number with digits after a point
9
Power to which a number is raised
10
Round shape with all points equidistant