Answer:
These go up by 1.
Step-by-step explanation:
10 20 30 40 50 60 70 80 90
1 + 1 = 2
2 + 1 = 3
3 + 1 = 4, and so forth.
A (they go up by one )
10, 20 , 30 ,40,50 The tens place goes up by 1 each time
