横向
1
Difference between highest and lowest values
5
Number greater than zero
6
The number representing nothing
7
Single numeral from 0 to 9
8
Repeated addition
纵向
2
Corner point of a polygon
3
Number divisible only by 1 and itself
4
Space between two intersecting lines
7
Number with digits after a point
9
Exact correspondence on both sides
10
Number that divides evenly into another
11
Collection of distinct elements