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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 381 · 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. 1.3 × 9 =
  2. 2.A father is 35 years old and his son is 10. How old was the father when the son was born?
  3. 3.9 × 9 =
  4. 4.4?81 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.12345678 × 9 + 9 =
  6. 6.1 + 2 + 3 + … + 30 =
  7. 7.1 + 3 + 5 + … + 9 =
  8. 8.6 × 9 =
  9. 9.14 × 4 =
  10. 10.Think of 15. Multiply it by 4, then add 2. What number do you end with?
  11. 11.12345 × 8 + 5 =
  12. 12.Double 77 =
  13. 13.Double 35 =
  14. 14.Magic square (every row, column and diagonal has the same total): 12 10 20 | 22 ? 6 | 8 18 16. What is the missing number?
  15. 15.1 + 2 + 3 + … + 69 =
  16. 16.13?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.45 × ? = 45000
  18. 18.Odd one out: which number is NOT in the 8 times table? (a) 48 (b) 16 (c) 32 (d) 74
  19. 19.You have 10 coins. Each coin is ₹1 or ₹2, and together they make ₹14. How many ₹2 coins do you have?
  20. 20.Think of 10. Multiply it by 5, then add 5. What number do you end with?
  21. 21.9 × 7 = ?3 — what is the missing digit?
  22. 22.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
  23. 23.1 + 2 + 3 + … + 83 =
  24. 24.24 × 4 =
  25. 25.Do the 1089 trick with 328: reverse and subtract, then reverse that answer and add. What do you get?
  26. 26.11 × 11 =
  27. 27.What comes next? 4, 9, 16, 25, ? (a) 34 (b) 37 (c) 38 (d) 36
  28. 28.9 × 9 = 8? — what is the missing digit?
  29. 29.Take 84 and take away the sum of its digits. What do you get?
  30. 30.49 × 4 =
  31. 31.23 × 4 =
  32. 32.What comes next? 5, 10, 20, 40, ? (a) 60 (b) 81 (c) 70 (d) 80
  33. 33.9 × 4 = 3? — what is the missing digit?
  34. 34.Double 56 =
  35. 35.10?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.1 + 3 + 5 + … + 43 =
  37. 37.Magic square (every row, column and diagonal has the same total): 15 12 27 | 30 18 6 | 9 ? 21. What is the missing number?
  38. 38.9 × 8 = 7? — what is the missing digit?
  39. 39.7 × 9 =
  40. 40.9 × 4 = ?6 — what is the missing digit?

Answer key

  1. 27
  2. 25
  3. 81
  4. 5
  5. 111111111
  6. 465
  7. 25
  8. 54
  9. 56
  10. 62
  11. 98765
  12. 154
  13. 70
  14. 14
  15. 2415
  16. 5
  17. 1000
  18. 74
  19. 4
  20. 55
  21. 6
  22. 792
  23. 3486
  24. 96
  25. 1089
  26. 121
  27. 36
  28. 1
  29. 72
  30. 196
  31. 92
  32. 80
  33. 6
  34. 112
  35. 5
  36. 484
  37. 24
  38. 2
  39. 63
  40. 3

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