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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 371 · 40 questions
TalentJR

The trick (Choose a trick): × 9 → finger trick; × 4 → double double; × 10, 100, 1000 → slide and add zeros. 37, 12345679 or 111… → magic patterns; reverse and subtract → 1089. Puzzles: find the rule, the total or the leftover days, then check your answer.

NameDateTime takenScore ___ / 40
  1. 1.9 × 8 = 7? — what is the missing digit?
  2. 2.Odd one out: which number is NOT in the 6 times table? (a) 24 (b) 56 (c) 42 (d) 36
  3. 3.9 × 6 = 5? — what is the missing digit?
  4. 4.In 4 years a boy will be 12 years old. How old was he 3 years ago?
  5. 5.3 × 9 =
  6. 6.If today is Friday, what day will it be after 39 days? (a) Wednesday (b) Tuesday (c) Monday (d) Friday
  7. 7.10 × 9 =
  8. 8.Odd one out: which number is NOT in the 3 times table? (a) 18 (b) 15 (c) 20 (d) 6
  9. 9.The 7th of a month is a Saturday. What day is the 23rd of the same month? (a) Thursday (b) Monday (c) Tuesday (d) Sunday
  10. 10.9 × 9 = 8? — what is the missing digit?
  11. 11.Do the 1089 trick with 730: reverse and subtract, then reverse that answer and add. What do you get?
  12. 12.51 × 4 =
  13. 13.Odd one out: which number is NOT in the 7 times table? (a) 15 (b) 35 (c) 21 (d) 28
  14. 14.8 × 9 =
  15. 15.A father is 31 years old and his son is 13. How old was the father when the son was born?
  16. 16.Take 38 and take away the sum of its digits. What do you get?
  17. 17.7 × 9 =
  18. 18.30 × 4 =
  19. 19.9 × 10 =
  20. 20.9 × 3 = ?7 — what is the missing digit?
  21. 21.12345679 × 9 =
  22. 22.Do the 1089 trick with 791: reverse and subtract, then reverse that answer and add. What do you get?
  23. 23.What comes next? 1, 2, 4, 8, ? (a) 17 (b) 16 (c) 14 (d) 12
  24. 24.What comes next? 20, 22, 24, 26, ? (a) 30 (b) 26 (c) 28 (d) 29
  25. 25.Take 11 and take away the sum of its digits. What do you get?
  26. 26.The 1st of a month is a Tuesday. What day is the 13th of the same month? (a) Monday (b) Saturday (c) Sunday (d) Wednesday
  27. 27.Magic square (every row, column and diagonal has the same total): 4 11 6 | 9 7 5 | ? 3 10. What is the missing number?
  28. 28.1 + 2 + 3 + … + 96 =
  29. 29.8 × 1000 =
  30. 30.Double 35 =
  31. 31.Take 123. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  32. 32.9 × 5 = ?5 — what is the missing digit?
  33. 33.52 × 10 =
  34. 34.If today is Monday, what day was it 38 days ago? (a) Saturday (b) Thursday (c) Friday (d) Monday
  35. 35.?407 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.Odd one out: which number is NOT in the 5 times table? (a) 25 (b) 30 (c) 15 (d) 23
  37. 37.I thought of a number, added 1 and then doubled it. I got 22. What was my number?
  38. 38.9 × 4 = ?6 — what is the missing digit?
  39. 39.12345679 × 18 =
  40. 40.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?

Answer key

  1. 2
  2. 56
  3. 4
  4. 5
  5. 27
  6. Tuesday
  7. 90
  8. 20
  9. Monday
  10. 1
  11. 1089
  12. 204
  13. 15
  14. 72
  15. 18
  16. 27
  17. 63
  18. 120
  19. 90
  20. 2
  21. 111111111
  22. 1089
  23. 16
  24. 28
  25. 9
  26. Sunday
  27. 8
  28. 4656
  29. 8000
  30. 70
  31. 198
  32. 4
  33. 520
  34. Friday
  35. 7
  36. 23
  37. 10
  38. 3
  39. 222222222
  40. 495

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