32 - 19 = 13. Unlucky for some?

# Number Sequences 5

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The numbers in a sequence are called 'terms'. In the sequence 3, 9, 27, 81, ... each number in the sequence can be got from the previous term by multiplying by 3. In this case, the rule is: multiply by 3. In 2, 4, 6, 8, ... '2' is the first term and '6' is the third term. See how you do with these simple sequences.

1.
Find the missing term.
-6, -9, -12, X, ...
-15
-18
-21
-24
The next term is got from the previous term by subtracting 3, e.g. -6 - 3 = -9 and so on
2.
Find the missing term.
9, 18, 36, X, ...
45
54
72
81
The next term is got from the previous term by multiplying by 2, e.g. 18 × 2 = 36 and so on
3.
Find the missing term.
1, 3, 5, 7, X, ...
11
9
13
15
The next term is got from the previous term by adding 2, e.g. 5 + 2 = 7 and so on
4.
Find the missing term.
2, 4, 6, 8, X, ...
10
12
14
16
The next term is got from the previous term by adding 2, e.g. 6 + 2 = 8 and so on
5.
Find the missing term.
..., 15, 20, 25, X, ...
35
40
45
30
The next term is got from the previous term by adding 5, e.g. 15 + 5 = 20 and so on
6.
Find the missing term.
14, 21, 28, X, ...
42
49
35
56
The next term is got from the previous term by adding 7, e.g. 14 + 7 = 21 and so on
7.
Find the missing term.
1, 3, 9, X, 81, ...
18
21
27
24
The next term is got from the previous term by multiplying it with 3, e.g. 9 × 3 = 27 and so on
8.
Find the missing term.
7, 2, -3, -8, X, ...
-3
-13
-5
-7
The next term is got from the previous term by subtracting 5, e.g. 2 - 5 = -3 and so on
9.
Find the missing term.
X, 32, 51, 70, 89, ...
13
15
17
16
The next term is got from the previous term by adding 19, e.g. 51 + 19 = 70 and so on
10.
Find the missing term.
4, 8, 12, 16, X, ...
28
32
24
20
The next term is got from the previous term by adding 4, e.g. 12 + 4 = 16 and so on
Author:  Frank Evans