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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 512 · 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 = 3? — what is the missing digit?
  2. 2.2 × 9 =
  3. 3.Magic square (every row, column and diagonal has the same total): 13 3 17 | 15 11 ? | 5 19 9. What is the missing number?
  4. 4.1 + 3 + 5 + … + 37 =
  5. 5.56 × 4 =
  6. 6.9 × 3 =
  7. 7.123 × 9 + 4 =
  8. 8.13 × 4 =
  9. 9.60 × 100 =
  10. 10.6 × 9 =
  11. 11.Double 86 =
  12. 12.Do the 1089 trick with 840: reverse and subtract, then reverse that answer and add. What do you get?
  13. 13.9 × 4 = ?6 — what is the missing digit?
  14. 14.10 × 9 =
  15. 15.Take 16 and take away the sum of its digits. What do you get?
  16. 16.297 + 792 =
  17. 17.Half of 164 =
  18. 18.9 × 2 = 1? — what is the missing digit?
  19. 19.What comes next? 9, 16, 25, 36, ? (a) 51 (b) 47 (c) 49 (d) 50
  20. 20.Double 13 =
  21. 21.761 × ? = 7610
  22. 22.40 × 4 =
  23. 23.792 + 297 =
  24. 24.If today is Friday, what day was it 50 days ago? (a) Thursday (b) Wednesday (c) Friday (d) Sunday
  25. 25.9 × 5 = 4? — what is the missing digit?
  26. 26.Half of 86 =
  27. 27.A piggy bank has 4 coins of ₹5 and 13 coins of ₹2. How many rupees are in it?
  28. 28.35 × 1000 =
  29. 29.I thought of a number, added 4 and then doubled it. I got 34. What was my number?
  30. 30.20 × 4 =
  31. 31.Do the 1089 trick with 622: reverse and subtract, then reverse that answer and add. What do you get?
  32. 32.Magic square (every row, column and diagonal has the same total): 14 16 6 | 4 12 20 | 18 8 ?. What is the missing number?
  33. 33.1 + 3 + 5 + … + 43 =
  34. 34.Double 92 =
  35. 35.I thought of a number, multiplied it by 3 and added 6. I got 36. What was my number?
  36. 36.If today is Monday, what day was it 20 days ago? (a) Wednesday (b) Friday (c) Tuesday (d) Monday
  37. 37.Magic square (every row, column and diagonal has the same total): 13 27 17 | 23 19 15 | 21 11 ?. What is the missing number?
  38. 38.If today is Saturday, what day was it 59 days ago? (a) Tuesday (b) Wednesday (c) Thursday (d) Saturday
  39. 39.Take 65 and take away the sum of its digits. What do you get?
  40. 40.The 6th of a month is a Friday. What day is the 16th of the same month? (a) Monday (b) Sunday (c) Tuesday (d) Thursday

Answer key

  1. 6
  2. 18
  3. 7
  4. 361
  5. 224
  6. 27
  7. 1111
  8. 52
  9. 6000
  10. 54
  11. 172
  12. 1089
  13. 3
  14. 90
  15. 9
  16. 1089
  17. 82
  18. 8
  19. 49
  20. 26
  21. 10
  22. 160
  23. 1089
  24. Thursday
  25. 5
  26. 43
  27. 46
  28. 35000
  29. 13
  30. 80
  31. 1089
  32. 10
  33. 484
  34. 184
  35. 10
  36. Tuesday
  37. 25
  38. Wednesday
  39. 54
  40. Monday

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