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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 24 · 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.If today is Sunday, what day was it 47 days ago? (a) Wednesday (b) Friday (c) Monday (d) Tuesday
  2. 2.Double 75 =
  3. 3.Double 66 =
  4. 4.Take 40 and take away the sum of its digits. What do you get?
  5. 5.27?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.Magic square (every row, column and diagonal has the same total): ? 12 7 | 6 10 14 | 13 8 9. What is the missing number?
  7. 7.9 × 5 =
  8. 8.Take 81 and take away the sum of its digits. What do you get?
  9. 9.12345679 × 27 =
  10. 10.9 × 4 =
  11. 11.123456 × 9 + 7 =
  12. 12.9 × 9 =
  13. 13.Magic square (every row, column and diagonal has the same total): 10 31 ? | 25 19 13 | 22 7 28. What is the missing number?
  14. 14.In 6 years a boy will be 16 years old. How old was he 3 years ago?
  15. 15.9 × 2 =
  16. 16.770 × ? = 7700
  17. 17.In 4 years a boy will be 16 years old. How old was he 5 years ago?
  18. 18.Magic trick! Think of 6. Double it, add 16, halve it, then take away 6. What number do you get?
  19. 19.9 × 2 = ?8 — what is the missing digit?
  20. 20.Magic trick! Think of 11. Double it, add 16, halve it, then take away 11. What number do you get?
  21. 21.56 × 4 =
  22. 22.Magic square (every row, column and diagonal has the same total): 22 8 18 | ? 16 20 | 14 24 10. What is the missing number?
  23. 23.Take 178. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  24. 24.The 3rd of a month is a Monday. What day is the 19th of the same month? (a) Tuesday (b) Thursday (c) Saturday (d) Wednesday
  25. 25.Half of 48 =
  26. 26.Half of 172 =
  27. 27.741? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.What comes next? 20, 24, 28, 32, ? (a) 36 (b) 40 (c) 32 (d) 37
  29. 29.What comes next? 4, 8, 12, 16, ? (a) 20 (b) 21 (c) 24 (d) 16
  30. 30.1 + 3 + 5 + … + 25 =
  31. 31.Magic square (every row, column and diagonal has the same total): 20 22 12 | 10 18 26 | 24 14 ?. What is the missing number?
  32. 32.60 × ? = 6000
  33. 33.?389 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.1 + 2 + 3 + … + 70 =
  35. 35.Half of 174 =
  36. 36.60 × 4 =
  37. 37.306 × 10 =
  38. 38.What comes next? 9, 13, 17, 21, ? (a) 25 (b) 29 (c) 26 (d) 21
  39. 39.9 × 5 = 4? — what is the missing digit?
  40. 40.Double 81 =

Answer key

  1. Tuesday
  2. 150
  3. 132
  4. 36
  5. 9
  6. 11
  7. 45
  8. 72
  9. 333333333
  10. 36
  11. 1111111
  12. 81
  13. 16
  14. 7
  15. 18
  16. 10
  17. 7
  18. 8
  19. 1
  20. 8
  21. 224
  22. 12
  23. 693
  24. Wednesday
  25. 24
  26. 86
  27. 6
  28. 36
  29. 20
  30. 169
  31. 16
  32. 100
  33. 7
  34. 2485
  35. 87
  36. 240
  37. 3060
  38. 25
  39. 5
  40. 162

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