Printable · GCSE Foundation · ages 14-16
Special sequences: square, cube, Fibonacci, quadratic, geometric worksheet — GCSE Foundation
Fifteen questions on "special sequences: square, cube, fibonacci, quadratic, geometric" — DfE statement A24. Print it, or print three versions so neighbours cannot copy by letter; the key gives the letter for each version.
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Special sequences: square, cube, Fibonacci, quadratic, geometric worksheet — GCSE Foundation
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- 1.The first five square numbers are 1, 4, 9, 16, 25. Write down the next square number in the sequence.
- 2.A company's profit is £500 in its first year. Each year after that, the profit is £300 more than the year before. Work out the profit in the company's 6th year.
- 3.A sequence starts at 2. Each term after that is found using the rule "double the previous term, then add 1". Work out the 4th term of the sequence.
- 4.The first term of an arithmetic sequence is 5, and each term after that increases by 6. Work out the 8th term of the sequence.
- 5.The triangular numbers begin 1, 3, 6, 10, 15, ... Work out the next term in the sequence.
- 6.The first five terms of a quadratic sequence are 5, 8, 13, 20, 29. Work out the next term in the sequence.
- 7.A fundraising chain letter starts with 3 people taking part in round 1. Each following round has 4 times as many people taking part as the round before. Work out the number of people taking part in round 4.
- 8.Four sequences are shown below. Sequence P: 4, 8, 16, 32, ... Sequence Q: 4, 8, 12, 16, ... Sequence R: 4, 7, 12, 19, ... Sequence S: 4, 9, 16, 25, ... Work out which of the sequences P, Q, R and S is geometric.
- 9.A Fibonacci-type sequence begins 3, 5, 8, 13, ... where each term after the second is the sum of the two terms before it. Work out the 7th term of the sequence.
- 10.A geometric sequence has first term 3 and common ratio 2. Work out the 5th term of the sequence.
- 11.A geometric sequence begins 162, 54, 18, 6, ... Work out the next term in the sequence.
- 12.Which of these numbers is a cube number?
- 13.An arithmetic sequence has first term 40 and common difference −6. Work out the 9th term of the sequence.
- 14.A colony of bacteria doubles in number every hour. At 9am there are 5 bacteria in the colony. Work out how many bacteria there will be at 12 noon.
- 15.A geometric sequence begins 80, 40, 20, 10, ... Work out the next term in the sequence.
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