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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 45 · 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 × 4 = ?6 — what is the missing digit?
  2. 2.123 × 8 + 3 =
  3. 3.Double 52 =
  4. 4.37 × ? = 37000
  5. 5.1 + 3 + 5 + … + 33 =
  6. 6.Half of 132 =
  7. 7.You have 13 coins. Each coin is ₹1 or ₹2, and together they make ₹15. How many ₹2 coins do you have?
  8. 8.?622 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.97 × 100 =
  10. 10.485 × 10 =
  11. 11.806 × ? = 8060
  12. 12.1 + 2 + 3 + … + 54 =
  13. 13.Half of 118 =
  14. 14.693 + 396 =
  15. 15.Half of 156 =
  16. 16.1234567 × 9 + 8 =
  17. 17.9 × 3 = 2? — what is the missing digit?
  18. 18.Do the 1089 trick with 219: reverse and subtract, then reverse that answer and add. What do you get?
  19. 19.Magic square (every row, column and diagonal has the same total): 9 19 5 | 7 11 15 | ? 3 13. What is the missing number?
  20. 20.9 × 10 = 9? — what is the missing digit?
  21. 21.111 × 111 =
  22. 22.Double 67 =
  23. 23.The 2nd of a month is a Friday. What day is the 24th of the same month? (a) Sunday (b) Tuesday (c) Friday (d) Saturday
  24. 24.2 × 9 =
  25. 25.22?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.9 × 9 =
  27. 27.15 × 4 =
  28. 28.46 × 4 =
  29. 29.32 × 100 =
  30. 30.8 × 9 =
  31. 31.Take 24 and take away the sum of its digits. What do you get?
  32. 32.12345679 × 72 =
  33. 33.Magic square (every row, column and diagonal has the same total): 8 3 ? | 1 5 9 | 6 7 2. What is the missing number?
  34. 34.Double 27 =
  35. 35.81?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.22?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.1111 × 1111 =
  38. 38.8?32 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.1 + 3 + 5 + … + 11 =
  40. 40.Take 230. Reverse its digits and take the smaller number away from the bigger one. What do you get?

Answer key

  1. 3
  2. 987
  3. 104
  4. 1000
  5. 289
  6. 66
  7. 2
  8. 8
  9. 9700
  10. 4850
  11. 10
  12. 1485
  13. 59
  14. 1089
  15. 78
  16. 11111111
  17. 7
  18. 1089
  19. 17
  20. 0
  21. 12321
  22. 134
  23. Saturday
  24. 18
  25. 7
  26. 81
  27. 60
  28. 184
  29. 3200
  30. 72
  31. 18
  32. 888888888
  33. 4
  34. 54
  35. 4
  36. 3
  37. 1234321
  38. 5
  39. 36
  40. 198

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