横向
1
Distance from center to edge of circle
4
Math using letters for unknown values
5
Sum divided by count
6
Number divisible only by 1 and itself
纵向
2
U-shaped curve of a quadratic function
3
Part of a whole number
7
Total distance around a shape
8
Rectangular array of numbers
9
Comparison of two quantities
10
Amount of space an object occupies
11
The number representing nothing
12
Result of addition