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Maths · Number

Find a sequence term

Use a stated or inferred linear rule to find a named term.

Watch the worked example

Jump to Any Term

This video shows how to use a linear rule to find a particular term in a number sequence. Watch an 11+ maths question solved step by step.

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Quick quiz: Find a sequence term

10 questions, with feedback after each one. No sign-up needed.

Read the questions in this quiz
  1. Question 1

    Ivy writes down the first 5 terms of a number sequence. What is term 17?

    Term 1
    Value
    44
    Term 2
    Value
    53
    Term 3
    Value
    62
    Term 4
    Value
    71
    Term 5
    Value
    80
    • A.188
    • B.197
    • C.179
    • D.153
  2. Question 2

    Noah writes down the first 5 terms of a number sequence. What is term 26?

    Term 1
    Value
    47
    Term 2
    Value
    61
    Term 3
    Value
    75
    Term 4
    Value
    89
    Term 5
    Value
    103
    • A.383
    • B.397
    • C.411
    • D.364
  3. Question 3

    Priya writes down the first 5 terms of a number sequence. What is term 24?

    Term 1
    Value
    28
    Term 2
    Value
    42
    Term 3
    Value
    56
    Term 4
    Value
    70
    Term 5
    Value
    84
    • A.350
    • B.364
    • C.420
    • D.336
  4. Question 4

    Ivy writes down the first 5 terms of a number sequence. What is term 15?

    Term 1
    Value
    5
    Term 2
    Value
    19
    Term 3
    Value
    33
    Term 4
    Value
    47
    Term 5
    Value
    61
    • A.215
    • B.210
    • C.187
    • D.201
  5. Question 5

    Omar writes down the first 5 terms of a number sequence. What is term 26?

    Term 1
    Value
    37
    Term 2
    Value
    51
    Term 3
    Value
    65
    Term 4
    Value
    79
    Term 5
    Value
    93
    • A.401
    • B.364
    • C.387
    • D.373
  6. Question 6

    Rosa writes down the first 5 terms of a number sequence. What is term 19?

    Term 1
    Value
    48
    Term 2
    Value
    69
    Term 3
    Value
    90
    Term 4
    Value
    111
    Term 5
    Value
    132
    • A.399
    • B.447
    • C.405
    • D.426
  7. Question 7

    Noah writes down the first 5 terms of a number sequence. What is term 15?

    Term 1
    Value
    50
    Term 2
    Value
    64
    Term 3
    Value
    78
    Term 4
    Value
    92
    Term 5
    Value
    106
    • A.210
    • B.260
    • C.246
    • D.232
  8. Question 8

    Priya writes down the first 5 terms of a number sequence. What is term 23?

    Term 1
    Value
    39
    Term 2
    Value
    48
    Term 3
    Value
    57
    Term 4
    Value
    66
    Term 5
    Value
    75
    • A.207
    • B.246
    • C.228
    • D.237
  9. Question 9

    Rosa writes down the first 5 terms of a number sequence. What is term 16?

    Term 1
    Value
    11
    Term 2
    Value
    32
    Term 3
    Value
    53
    Term 4
    Value
    74
    Term 5
    Value
    95
    • A.305
    • B.326
    • C.347
    • D.336
  10. Question 10

    Rosa writes down the first 5 terms of a number sequence. What is term 22?

    Term 1
    Value
    47
    Term 2
    Value
    56
    Term 3
    Value
    65
    Term 4
    Value
    74
    Term 5
    Value
    83
    • A.245
    • B.227
    • C.236
    • D.198

Practise it now

The frog can only land on a stone that carries on the pattern. Tap the lily pads to fill both blank stones.

This exercise practises find a sequence term alongside its own main skill, Number Sequences.

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A worked example

One question of the kind this skill is tested with, worked all the way through: the reasoning, and what the wrong answers are there to catch.

Jumping to a term further down a sequence

Omar writes down the first 4 terms of a number sequence. What is term 10?

The Position column numbers the terms; the Value column holds them.

Term 1
Value
10
Term 2
Value
17
Term 3
Value
24
Term 4
Value
31

Data table with columns Position, Value. Rows: Position Term 1, Value 10; Position Term 2, Value 17; Position Term 3, Value 24; Position Term 4, Value 31.

Table columns: Position, Value. Rows: Term 1, 10; Term 2, 17; Term 3, 24; Term 4, 31.

  1. 70
  2. 80
  3. 73
  4. 66

Answer: 73

How you get there

Term 1 is 10 and each step adds 7, and there are 9 steps from term 1 to term 10, so the value is 10+9 x 7, which equals 73.

Why the other answers tempt

Term 10 sits 9 steps along, not 10 steps along.

If they are stuck, say this

Count how many steps separate term 1 from term 10, and note that it is one fewer than 10.

Now do it live in Frog Sequence Hop

What this exercise is doing

Frog Sequence Hop

The frog can only land on a stone that carries on the pattern. Tap the lily pads to fill both blank stones.

This engine’s own main skill is Number Sequences. It practises find a sequence term alongside it.

The trap here is to spot the first gap and assume every gap is the same. From 3 to 6 the gap is 3, but from 6 to 12 the gap is 6, and from 12 to 24 it is 12. When the gaps themselves keep growing, stop adding and start looking for a multiplier: 3 times 2 is 6, 6 times 2 is 12, 12 times 2 is 24, so the sequence doubles and the next terms are 48 and 96. The general strategy for any sequence is to write the differences underneath first. Equal differences mean add the same number every time. Growing differences mean try multiplying, and if that fails try squares or a two-step rule such as double then add one.

What to say if they get stuck

  1. Work out what happens between each pair of stones. Write the jumps down: 3 to 6, 6 to 12, 12 to 24.
  2. The jumps are 3, then 6, then 12. They are not the same size, so this is not an adding sequence.
  3. Each stone is the one before it multiplied by 2. So the next stone is 24 times 2.

Open Frog Sequence Hop on its own page to share it

How find a sequence term differs from the skills beside it

The same exercise practises several skills, and telling them apart is often the difficulty rather than the exercise itself. On this page the skill is: use a stated or inferred linear rule to find a named term, and it stops where one linear sequence only.

Related maths skills

All maths 11+ skills

Questions parents ask about find a sequence term

What this skill involves, common mistakes and ways to practise it at home.

Use a stated or inferred linear rule to find a named term. It is one of 55 named maths skills in the 11+, in the number strand, and this page carries 1 interactive exercise that practises it.

Knowing which maths topic to practise is most of the work

A free diagnostic covers arithmetic, fractions, geometry, measure and data handling, and comes back with the topics to spend the next few weeks on.