横向
1
Part of a whole number
5
Repeated addition
6
Middle value in an ordered dataset
8
Symbol representing unknown value
10
Difference between highest and lowest values
纵向
2
Number greater than zero
3
Lines that never intersect
4
Amount of space an object occupies
7
Result of addition
9
Part of a circle's circumference
11
Number with digits after a point
12
Math using letters for unknown values