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40 math trivia questions with answers

Number, fraction, shape and algebra questions with worked answers. Use the explanations to check the method as well as the result.

40 questions · Math trivia questions with answers · answers included

Math trivia questions with answers

Choose a score button to add a point. Scores last for this page visit.

Space shows the answer, then the next card. Arrow keys move. With scores on, keys 1 to 6 add a team point. F fills the screen. Escape closes play.
  1. 1

    What is 17 + 26?

    medium

    Answer

    43

    17 + 20 + 6 = 43.

  2. 2

    What is 90 − 37?

    medium

    Answer

    53

    90 − 30 − 7 = 53.

  3. 3

    What is 8 × 7?

    medium

    Answer

    56

    Eight groups of seven total 56.

  4. 4

    What is 144 ÷ 12?

    medium

    Answer

    12

    12 × 12 = 144.

  5. 5

    What is half of three quarters?

    medium

    Answer

    Three eighths

    3/4 × 1/2 = 3/8.

  6. 6

    Write one fifth as a decimal.

    medium

    Answer

    0.2

    1 ÷ 5 = 0.2.

  7. 7

    What is 15% of 200?

    medium

    Answer

    30

    0.15 × 200 = 30.

  8. 8

    A price rises from 40 to 50. What is the percentage increase?

    medium

    Answer

    25%

    The increase is 10; 10 ÷ 40 × 100 = 25.

  9. 9

    What is the square root of 81?

    medium

    Answer

    9

    9 × 9 = 81.

  10. 10

    What is 2 to the fifth power?

    medium

    Answer

    32

    2 × 2 × 2 × 2 × 2 = 32.

  11. 11

    What is the perimeter of a square with side 6 cm?

    medium

    Answer

    24 cm

    Four sides × 6 cm = 24 cm.

  12. 12

    What is the area of a rectangle 8 cm by 3 cm?

    medium

    Answer

    24 square centimetres

    8 × 3 = 24.

  13. 13

    What is the mean of 4, 7 and 10?

    medium

    Answer

    7

    (4 + 7 + 10) ÷ 3 = 7.

  14. 14

    What is the median of 2, 3, 9, 11 and 20?

    medium

    Answer

    9

    The middle entry of the ordered list is 9.

  15. 15

    Which appears most often in 4, 5, 4, 7, 4, 5?

    medium

    Answer

    4

    Four appears three times.

  16. 16

    Solve 3x + 2 = 17.

    medium

    Answer

    x = 5

    Subtract 2 then divide by 3.

  17. 17

    What is the next number in 3, 6, 12, 24 if each term doubles?

    medium

    Answer

    48

    24 × 2 = 48.

  18. 18

    How many minutes are in two and a half hours?

    medium

    Answer

    150

    2.5 × 60 = 150.

  19. 19

    How many sides do three separate triangles have altogether?

    medium

    Answer

    9

    3 × 3 = 9.

  20. 20

    How many degrees remain from a straight angle after 65 degrees?

    medium

    Answer

    115 degrees

    180 − 65 = 115.

  21. 21

    What is 0.6 + 0.25?

    medium

    Answer

    0.85

    60 hundredths + 25 hundredths = 85 hundredths.

  22. 22

    What is 5 factorial?

    medium

    Answer

    120

    5 × 4 × 3 × 2 × 1 = 120.

  23. 23

    How many ways can three distinct books be arranged?

    medium

    Answer

    6

    3 × 2 × 1 = 6.

  24. 24

    A bag contains 3 red and 2 blue counters. What fraction are blue?

    medium

    Answer

    Two fifths

    2 of the 5 counters are blue.

  25. 25

    What is the least common multiple of 6 and 8?

    medium

    Answer

    24

    6 × 4 and 8 × 3 both equal 24.

  26. 26

    What is the greatest common divisor of 18 and 24?

    medium

    Answer

    6

    The shared positive divisors are 1, 2, 3 and 6.

  27. 27

    How many edges does a cube have?

    medium

    Answer

    12

    Four top edges, four bottom edges and four joining edges.

  28. 28

    What is the volume of a cube with side 3 cm?

    medium

    Answer

    27 cubic centimetres

    3 × 3 × 3 = 27.

  29. 29

    What is −4 + 9?

    medium

    Answer

    5

    Start at −4 and move nine places right.

  30. 30

    What is −3 × −6?

    medium

    Answer

    18

    The product of two negatives is positive.

  31. 31

    What is 7 squared minus 4 squared?

    medium

    Answer

    33

    49 − 16 = 33.

  32. 32

    What is 2/3 + 1/6?

    medium

    Answer

    5/6

    4/6 + 1/6 = 5/6.

  33. 33

    What is 3/4 divided by 1/2?

    medium

    Answer

    3/2, or 1.5

    3/4 × 2 = 6/4.

  34. 34

    What is the sum of the first five positive integers?

    medium

    Answer

    15

    1 + 2 + 3 + 4 + 5 = 15.

  35. 35

    How many two-digit numbers end in 0?

    medium

    Answer

    9

    10 through 90, in steps of 10.

  36. 36

    A 120 km trip takes 3 hours. What is the average speed?

    medium

    Answer

    40 km/h

    120 ÷ 3 = 40.

  37. 37

    A rectangle has area 36 and width 4. What is its length?

    medium

    Answer

    9

    36 ÷ 4 = 9.

  38. 38

    What is 3 cubed?

    medium

    Answer

    27

    3 × 3 × 3 = 27.

  39. 39

    What is the sum of 0.125 and 0.875?

    medium

    Answer

    1

    125 thousandths + 875 thousandths = 1000 thousandths.

  40. 40

    Round 7.46 to one decimal place.

    medium

    Answer

    7.5

    The hundredths digit is 6, so the tenths digit rounds up.

Timer and team scores

8 turns × 60 seconds = 8 minutes of play, plus instructions and breaks.

60

Pause whenever the group needs more time.

Team Lime's turn

Team Lime: 0

Team Violet: 0

Use this set with a group

Read a prompt, allow thinking time, then invite an answer or a pass. For a timed round, choose a turn length before starting. A host can keep the printed answers out of view until the round ends.