横向
1
Split into equal parts
2
Closed shape with straight sides
4
Number less than zero
6
Proven mathematical statement
8
Math using letters for unknown values
9
Mathematical rule or equation
纵向
2
Number divisible only by 1 and itself
3
Line crossing from corner to corner
5
Number with digits after a point
7
Divisible by two
10
Rectangle with four equal sides
11
Number that divides evenly into another
12
Space between two intersecting lines
13
U-shaped curve of a quadratic function