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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.

TIP: Knowing your times tables will help you with sequences.

1.

Find the missing term.

1, 3, 9, X, 81, ...

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

2.

Find the missing term.

X, 32, 51, 70, 89, ...

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

3.

Find the missing term.

..., 15, 20, 25, X, ...

..., 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

4.

Find the missing term.

2, 4, 6, 8, X, ...

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.

4, 8, 12, 16, X, ...

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

6.

Find the missing term.

1, 3, 5, 7, X, ...

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

7.

Find the missing term.

9, 18, 36, X, ...

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

8.

Find the missing term.

7, 2, -3, -8, X, ...

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.

14, 21, 28, X, ...

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

10.

Find the missing term.

-6, -9, -12, X, ...

-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