complete the pattern

12,18,15,21,18,?,?,?,?,?,?,
13,26,18,36,23,?,?,?,?,?,?,?,
44,54,47,57,50,?,?,?,?,?,?,?,
5,14,15,24,25,?,?,?,?,?,?,?,?

12,18,15,21,18,24,21,27,24,30,27(+6,-3)

5,14,15,24,25,34,35,44,45,54,55 (+9,+1)

12,18,15,21,18,?,?,?,?,?,?,

12 + 6 = 18
18 - 3 = 15
15 + 6 = 21
21 - 3 = 18
What do you think the next numbers are?

13,26,18,36,23,?,?,?,
13 * 2 = 26
13 + 5 = 18
18 * 2 = 36
18 + 5 = 23
What do you think the next numbers are?

Can you see a pattern in the next two groups of numbers? If you post your answers, we'll be glad to check them for you.

hints NOT ANSWERS !!!

+6 -3 + 6 - 3 ....

*2 + (back 2+5) *2 + (back2 +5)

+10 -7 +10 -7

9 1 1 9 1 1 9 1 1 ....

12,18,15,21,18,24,21,27,24,30,27,34

13,26,18,36,23,36,28,41,33,46,38,51
44,54,47,57,50,60,63,73,66,76,69,79,72,
15,14,15,24,25,34,35,44,45,54,55

To complete the pattern:

For the first pattern:
We can notice that the pattern alternates between adding 6 and subtracting 3 from each term.
12 + 6 = 18
18 - 3 = 15
15 + 6 = 21
21 - 3 = 18

Using the same pattern, we can continue:
18 + 6 = 24
24 - 3 = 21
21 + 6 = 27
27 - 3 = 24

So the missing terms in the first pattern are 24, 21, and 27.

For the second pattern:
The pattern alternates between multiplying by 2 and subtracting 8 from each term.
13 * 2 = 26
26 - 8 = 18
18 * 2 = 36
36 - 8 = 28

Following the same pattern, we can continue:
28 * 2 = 56
56 - 8 = 48
48 * 2 = 96
96 - 8 = 88

Therefore, the missing terms in the second pattern are 28, 48, and 88.

For the third pattern:
The pattern alternates between adding 10 to the first digit and subtracting 7 from the second digit.
44 + 10 = 54
54 - 7 = 47
47 + 10 = 57
57 - 7 = 50

We can continue the pattern:
50 + 10 = 60
60 - 7 = 53
53 + 10 = 63
63 - 7 = 56

Thus, the missing terms in the third pattern are 60, 53, and 63.

For the fourth pattern:
The pattern alternates between adding 9 and subtracting 1 from each term.
5 + 9 = 14
14 + 1 = 15
15 + 9 = 24
24 + 1 = 25

Following the same pattern, we can continue:
25 + 9 = 34
34 + 1 = 35
35 + 9 = 44
44 + 1 = 45
Therefore, the missing terms in the fourth pattern are 34, 35, 44, and 45.