横向
1
Repeated addition
4
Number divisible only by 1 and itself
5
Closed shape with straight sides
6
Math using letters for unknown values
9
Line segment connecting two circle points
纵向
1
Middle value in an ordered dataset
2
Single numeral from 0 to 9
3
Round shape with all points equidistant
7
Mathematical rule or equation
8
Collection of distinct elements