Counting by Fives

You can count by fives by adding five to the previous count.

If you start with a zero then each number will end in either 5 or 0.

The numbers that you would count if you started with 0 and counted by fives would be:
0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100.

If you start the count with another number, then just add five to the last count.  For example:
1, 6, 11, 16, 21, 26, 31, 36, 41, 46, 51, 56 and so on.

Notice that there is a regular pattern in these counts.  Every other number ends with the same digit.

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100







What is the Next Number if Counting Up by Fives?

The next number after when counting by fives is