Puzzles & problem solving: the 11 Plus question types

Logic puzzles, reasoning with numbers, working systematically.

About 60 seconds a question in the testTry five with worked answers

Every question here is written by Prism in the style of the tests. None is copied from a real paper, and a fresh one is drawn each time a child practises.

From foundation to exam standard

Two questions at each level. Tap an option to check it.

Foundation where a child in Year 3 or 4 starts

Question 1Aim for about 60 seconds

Two numbers add up to 9. One of them is 3. What is the other number multiplied by 2?

Show the worked answer

Answer: C, 12

How to work it out

  1. The other number is 9 − 3 = 6.
  2. Doubled: 12.

Why the other options are wrong

  • A (22): This is 10 more than the correct answer, so the tens column is out. Recheck the working.
  • B (9): This is the total, not the other number doubled.
  • D (6): This is the other number, 6; the question asks for it multiplied by 2.
  • E (24): This is double the correct answer, 12. Check whether you doubled when you should not have.
Question 2Aim for about 60 seconds

Using coins (1p, 2p, 5p, 10p, 20p, 50p, £1, £2), what is the fewest coins that make exactly 44p?

Show the worked answer

Answer: C, 4

How to work it out

  1. Take the biggest coin that fits each time: 20p, 20p, 2p, 2p.
  2. That is 4 coins.

Why the other options are wrong

  • A (1): This counts 50p coins only and cannot make the exact amount.
  • B (6): Two coins too many.
  • D (5): One coin too many; a bigger coin can replace two smaller ones somewhere.
  • E (3): One coin too few; no set of that many coins makes the amount exactly.

Standard the 11 Plus standard, Year 5

Question 3Aim for about 60 seconds

A farmyard has chickens and sheep. There are 13 heads and 44 legs. How many sheep are there?

Show the worked answer

Answer: E, 9

How to work it out

  1. If all 13 were chickens there would be 26 legs.
  2. Each sheep adds 2 more: (44 − 26) ÷ 2 = 9 sheep.

Why the other options are wrong

  • A (4): This is the number of chickens, not sheep.
  • B (10): This is one sheep too many; check the extra legs.
  • C (11): This divides all the legs by 4, as if every animal were a sheep.
  • D (8): This is 1 less than the correct answer, so the last step of the working is out by one.
Question 4Aim for about 60 seconds

This problem cannot be solved yet: “A train leaves at 09:40. What time does it arrive?” What else do you need to know?

Show the worked answer

Answer: E, How long the journey takes

How to work it out

  1. Ask what the calculation needs.
  2. How long the journey takes: without that, no answer is possible.

Why the other options are wrong

  • A (How fast the train goes): Speed alone does not give the time without the distance.
  • B (What platform it leaves from): The platform makes no difference.
  • C (How many carriages it has): The carriages make no difference.
  • D (How many stops it makes): Stops alone do not give the arrival time.

Exam standard what the papers ask in Year 6

Question 5Aim for about 60 seconds

A book has 406 pages. Oscar reads 24 pages a day. How many days does it take to finish it?

Show the worked answer

Answer: D, 17

How to work it out

  1. 406 ÷ 24 = 16 remainder 22.
  2. The last 22 pages need one more day: 17 days.

Why the other options are wrong

  • A (24): This is the pages read in one day, not the number of days.
  • B (18): 17 days already finish the book, so one more is not needed.
  • C (7): This is 10 less than the correct answer, so the tens column is out. Recheck the working.
  • E (16): 16 days read only 384 pages; 22 are still left.
Question 6Aim for about 60 seconds

A atlas has 448 pages. Priya reads 18 pages a day. How many days does it take to finish it?

Show the worked answer

Answer: E, 25

How to work it out

  1. 448 ÷ 18 = 24 remainder 16.
  2. The last 16 pages need one more day: 25 days.

Why the other options are wrong

  • A (15): This is 10 less than the correct answer, so the tens column is out. Recheck the working.
  • B (18): This is the pages read in one day, not the number of days.
  • C (24): 24 days read only 432 pages; 16 are still left.
  • D (26): 25 days already finish the book, so one more is not needed.

The kinds of question in this topic

Each kind asks something different of a child, even when the numbers or shapes look alike.

Working backwards

Undo a chain of operations to find the starting number.

Exam standard
Question 7Aim for about 60 seconds

I think of a number, multiply it by 3, add 6, then divide by 3. The answer is 19. What was my number?

Show the worked answer

Answer: D, 17

How to work it out

Undo in reverse order: 19 × 3 = 57, 57 − 6 = 51, 51 ÷ 3 = 17.

Why the other options are wrong

  • A (57): This stops after undoing the division by 3.
  • B (13): This undoes the steps in the wrong order: the last step must be undone first.
  • C (21): This adds 6 when undoing instead of taking it away.
  • E (18): One more than the number; check the final division.

A number from clues about its digits

The digits add to this and differ by that: which number?

Exam standard
Question 8Aim for about 60 seconds

I am thinking of a two-digit number. Its digits add up to 14. The units digit is 4 more than the tens digit. It is odd. What is the number?

Show the worked answer

Answer: D, 59

How to work it out

  1. Try pairs of digits that add to 14; only 5 and 9 are 4 apart with the units digit bigger.
  2. The number is 59.

Why the other options are wrong

  • A (14): This is the digit sum, not the number.
  • B (95): These are the right digits the wrong way round; check which digit the clue says is bigger.
  • C (50): The digits of this number add to the right total but are not the right distance apart; check the second clue.
  • E (68): The digits of this number add to the right total but are not the right distance apart.

Which statement must be true

Test each statement against every case, not just one.

Exam standard
Question 9Aim for about 60 seconds

Two whole numbers are both odd. Which statement must be true?

Show the worked answer

Answer: D, Their sum is even

How to work it out

  1. Test each statement with examples.
  2. Only “their sum is even” is true for every case.

Why the other options are wrong

  • A (Their product is even): Odd times odd is odd: 3 × 5 = 15.
  • B (Their sum is odd): Odd plus odd is always even: 3 + 5 = 8.
  • C (Their difference is odd): Odd minus odd is even: 7 − 3 = 4.
  • E (One of them is a multiple of 4): A multiple of 4 is even, so neither can be.

Find the line with the mistake

A worked calculation in three lines; one line is wrong.

Exam standard
Question 10Aim for about 60 seconds

Farid works out (26 + 24) × 5 − 10 in three lines. One line has a mistake. Which line?

  1. Line 1: 26 + 24 = 51
  2. Line 2: 51 × 5 = 255
  3. Line 3: 255 − 10 = 245
Show the worked answer

Answer: A, Line 1

How to work it out

  1. Check each line on its own.
  2. Line 1 is wrong: 26 + 24 = 50, not what is written.

Why the other options are wrong

  • B (Two lines are wrong): Only line 1 fails its own calculation; the other two are worked correctly from the line before.
  • C (Line 2): Line 2 is worked correctly from the line before it; the slip is earlier or later.
  • D (Line 3): Line 3 is worked correctly from the line before it; the slip is earlier or later.
  • E (No line is wrong): Check line 1 again: the calculation on that line does not give the number written.

What else you would need to know

A problem that cannot be solved yet: what is missing?

Exam standard
Question 11Aim for about 60 seconds

This problem cannot be solved yet: “A box of pencils costs £3. How much do the pencils cost altogether?” What else do you need to know?

Show the worked answer

Answer: D, How many boxes were bought

How to work it out

  1. Ask what the calculation needs.
  2. How many boxes were bought: without that, no answer is possible.

Why the other options are wrong

  • A (How many pencils are in a box): The price is for a box, so the number inside does not change the total.
  • B (How long the pencils are): Length has nothing to do with the cost.
  • C (What colour the pencils are): Colour has nothing to do with the cost.
  • E (What shop sold them): The shop makes no difference to the sum.

The number you do not need

A problem with one figure that plays no part.

Exam standard
Question 12Aim for about 60 seconds

Aisha has 508p and a 67-page comic. Aisha buys 4 packets of stickers at 12p each. How much money is left?

Show the worked answer

Answer: A, 460p

How to work it out

  1. The comic's pages are not needed.
  2. The stickers cost 4 × 12 = 48p, so 508 − 48 = 460p is left.

Why the other options are wrong

  • B (496p): This takes off the price of one packet only.
  • C (448p): This takes off one more packet than Aisha bought.
  • D (527p): This adds the pages, which are not money.
  • E (441p): This takes away the number of pages, which has nothing to do with the money.

The fewest coins

Make an amount with as few coins as possible.

Exam standard
Question 13Aim for about 60 seconds

Using coins (1p, 2p, 5p, 10p, 20p, 50p, £1, £2), what is the fewest coins that make exactly 83p?

Show the worked answer

Answer: C, 5

How to work it out

  1. Take the biggest coin that fits each time: 50p, 20p, 10p, 2p, 1p.
  2. That is 5 coins.

Why the other options are wrong

  • A (7): Two coins too many.
  • B (2): This counts 50p coins only and cannot make the exact amount.
  • D (4): One coin too few; no set of that many coins makes the amount exactly.
  • E (6): One coin too many; a bigger coin can replace two smaller ones somewhere.

Estimate by rounding

Round first, then multiply.

Exam standard
Question 14Aim for about 60 seconds

Estimate 473 × 23 by rounding 473 to the nearest 100 and 23 to the nearest 10.

Show the worked answer

Answer: E, 10,000

How to work it out

  1. 473 rounds to 500 and 23 to 20.
  2. 500 × 20 = 10,000.

Why the other options are wrong

  • A (100,000): Ten times too big; check the zeros when multiplying rounded numbers.
  • B (12,000): 473 rounds to 500, not 600.
  • C (1,000): Ten times too small; check the zeros.
  • D (10,879): This is the exact answer; the question asks for an estimate made by rounding first.

More maths

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