横向
1
Single numeral from 0 to 9
2
Result of addition
4
Rectangle with four equal sides
5
Rectangular array of numbers
7
Result of multiplication
8
Number divisible only by 1 and itself
9
Round shape with all points equidistant
纵向
2
Exact correspondence on both sides
3
Part of a whole number
6
Symbol representing unknown value
7
Lines that never intersect