横向
1
Collection of distinct elements
3
Value that does not change
4
Math using letters for unknown values
5
Repeated addition
6
Number less than zero
纵向
1
System of ordered marks for measuring
2
Split into equal parts
7
Result of addition
Collection of distinct elements
Value that does not change
Math using letters for unknown values
Repeated addition
Number less than zero
System of ordered marks for measuring
Split into equal parts
Result of addition