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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 62 · 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.Magic square (every row, column and diagonal has the same total): 12 22 ? | 10 14 18 | 20 6 16. What is the missing number?
  2. 2.2 × 9 =
  3. 3.What comes next? 1, 4, 9, 16, ? (a) 26 (b) 27 (c) 23 (d) 25
  4. 4.If today is Tuesday, what day was it 36 days ago? (a) Monday (b) Sunday (c) Tuesday (d) Thursday
  5. 5.Magic square (every row, column and diagonal has the same total): ? 28 13 | 10 22 34 | 31 16 19. What is the missing number?
  6. 6.Magic square (every row, column and diagonal has the same total): 8 18 16 | 22 14 ? | 12 10 20. What is the missing number?
  7. 7.The 6th of a month is a Sunday. What day is the 18th of the same month? (a) Saturday (b) Monday (c) Friday (d) Thursday
  8. 8.If today is Thursday, what day will it be after 52 days? (a) Wednesday (b) Saturday (c) Monday (d) Sunday
  9. 9.9 × 3 = 2? — what is the missing digit?
  10. 10.Double 61 =
  11. 11.I thought of a number, added 7 and then doubled it. I got 34. What was my number?
  12. 12.?103 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.9 × 8 =
  14. 14.55 × 4 =
  15. 15.12345679 × 9 =
  16. 16.Magic trick! Think of 8. Double it, add 4, halve it, then take away 8. What number do you get?
  17. 17.9 × 10 = 9? — what is the missing digit?
  18. 18.Magic square (every row, column and diagonal has the same total): 25 11 ? | 15 19 23 | 17 27 13. What is the missing number?
  19. 19.Magic square (every row, column and diagonal has the same total): ? 14 9 | 8 12 16 | 15 10 11. What is the missing number?
  20. 20.9 × 2 = ?8 — what is the missing digit?
  21. 21.A piggy bank has 3 coins of ₹5 and 15 coins of ₹2. How many rupees are in it?
  22. 22.9 × 3 =
  23. 23.1 + 3 + 5 + … + 19 =
  24. 24.123456 × 8 + 6 =
  25. 25.32 × 4 =
  26. 26.50 × 4 =
  27. 27.Do the 1089 trick with 183: reverse and subtract, then reverse that answer and add. What do you get?
  28. 28.Half of 166 =
  29. 29.58 × 100 =
  30. 30.111111 × 111111 =
  31. 31.297 + 792 =
  32. 32.37 × 3 =
  33. 33.I thought of a number, multiplied it by 2 and added 6. I got 28. What was my number?
  34. 34.I thought of a number, multiplied it by 2 and added 3. I got 13. What was my number?
  35. 35.42 × 100 =
  36. 36.Double 29 =
  37. 37.9 × 9 = ?1 — what is the missing digit?
  38. 38.1 + 2 + 3 + … + 83 =
  39. 39.Take 61 and take away the sum of its digits. What do you get?
  40. 40.Odd one out: which number is NOT in the 4 times table? (a) 22 (b) 16 (c) 20 (d) 24

Answer key

  1. 8
  2. 18
  3. 25
  4. Monday
  5. 25
  6. 6
  7. Friday
  8. Sunday
  9. 7
  10. 122
  11. 10
  12. 5
  13. 72
  14. 220
  15. 111111111
  16. 2
  17. 0
  18. 21
  19. 13
  20. 1
  21. 45
  22. 27
  23. 100
  24. 987654
  25. 128
  26. 200
  27. 1089
  28. 83
  29. 5800
  30. 12345654321
  31. 1089
  32. 111
  33. 11
  34. 5
  35. 4200
  36. 58
  37. 8
  38. 3486
  39. 54
  40. 22

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