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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 128 · 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.Take 11 and take away the sum of its digits. What do you get?
  2. 2.886? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.1234 × 9 + 5 =
  4. 4.9 × 9 = 8? — what is the missing digit?
  5. 5.In 3 years a boy will be 13 years old. How old was he 5 years ago?
  6. 6.297 + 792 =
  7. 7.9 × 2 = 1? — what is the missing digit?
  8. 8.111 × 111 =
  9. 9.15 × 4 =
  10. 10.86 × 100 =
  11. 11.What comes next? 4, 9, 16, 25, ? (a) 38 (b) 36 (c) 34 (d) 37
  12. 12.A piggy bank has 8 coins of ₹5 and 9 coins of ₹2. How many rupees are in it?
  13. 13.Magic trick! Think of 5. Double it, add 14, halve it, then take away 5. What number do you get?
  14. 14.9 × 7 = ?3 — what is the missing digit?
  15. 15.I thought of a number, added 2 and then doubled it. I got 10. What was my number?
  16. 16.I thought of a number, multiplied it by 5 and added 1. I got 16. What was my number?
  17. 17.9 × 9 =
  18. 18.9 × 3 = ?7 — what is the missing digit?
  19. 19.22 × 4 =
  20. 20.123 × 9 + 4 =
  21. 21.723? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.A piggy bank has 8 coins of ₹5 and 6 coins of ₹2. How many rupees are in it?
  23. 23.1 + 2 + 3 + … + 6 =
  24. 24.21 × 4 =
  25. 25.11111 × 11111 =
  26. 26.Magic square (every row, column and diagonal has the same total): ? 10 25 | 28 16 4 | 7 22 19. What is the missing number?
  27. 27.18 × 4 =
  28. 28.396 + 693 =
  29. 29.Do the 1089 trick with 821: reverse and subtract, then reverse that answer and add. What do you get?
  30. 30.693 + 396 =
  31. 31.I thought of a number, added 6 and then doubled it. I got 48. What was my number?
  32. 32.12 × 4 =
  33. 33.What comes next? 4, 9, 14, 19, ? (a) 24 (b) 19 (c) 25 (d) 29
  34. 34.I thought of a number, multiplied it by 3 and added 1. I got 34. What was my number?
  35. 35.590 × 10 =
  36. 36.Half of 104 =
  37. 37.318 × 10 =
  38. 38.Half of 176 =
  39. 39.What comes next? 19, 25, 31, 37, ? (a) 43 (b) 44 (c) 49 (d) 37
  40. 40.1 + 3 + 5 + … + 49 =

Answer key

  1. 9
  2. 5
  3. 11111
  4. 1
  5. 5
  6. 1089
  7. 8
  8. 12321
  9. 60
  10. 8600
  11. 36
  12. 58
  13. 7
  14. 6
  15. 3
  16. 3
  17. 81
  18. 2
  19. 88
  20. 1111
  21. 6
  22. 52
  23. 21
  24. 84
  25. 123454321
  26. 13
  27. 72
  28. 1089
  29. 1089
  30. 1089
  31. 18
  32. 48
  33. 24
  34. 11
  35. 5900
  36. 52
  37. 3180
  38. 88
  39. 43
  40. 625

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