横向
1
Symbol representing unknown value
2
Repeated addition
5
Number that divides evenly into another
6
Space between two intersecting lines
7
Number with digits after a point
9
Rectangle with four equal sides
13
Exact correspondence on both sides
纵向
2
Middle value in an ordered dataset
3
Proven mathematical statement
4
Split into equal parts
8
Part of a whole number
10
Math using letters for unknown values
11
Lines that never intersect
12
Round shape with all points equidistant