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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 691 · 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.?174 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.I thought of a number, added 3 and then doubled it. I got 20. What was my number?
  3. 3.1 + 2 + 3 + … + 34 =
  4. 4.12 × 9 + 3 =
  5. 5.Double 92 =
  6. 6.A piggy bank has 10 coins of ₹5 and 4 coins of ₹2. How many rupees are in it?
  7. 7.26 × 4 =
  8. 8.3?17 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.123456789 × 8 + 9 =
  10. 10.9 × 10 = ?0 — what is the missing digit?
  11. 11.9 × 7 =
  12. 12.12345 × 8 + 5 =
  13. 13.4 × 9 =
  14. 14.Think of 2. Multiply it by 4, then add 5. What number do you end with?
  15. 15.If today is Thursday, what day was it 21 days ago? (a) Sunday (b) Wednesday (c) Thursday (d) Friday
  16. 16.9 × 4 = 3? — what is the missing digit?
  17. 17.Do the 1089 trick with 774: reverse and subtract, then reverse that answer and add. What do you get?
  18. 18.Magic square (every row, column and diagonal has the same total): 2 7 6 | 9 5 1 | ? 3 8. What is the missing number?
  19. 19.What comes next? 1, 2, 4, 8, ? (a) 16 (b) 12 (c) 14 (d) 17
  20. 20.940 × 10 =
  21. 21.10 × 9 =
  22. 22.9 × 2 = ?8 — what is the missing digit?
  23. 23.Magic square (every row, column and diagonal has the same total): 9 4 11 | 10 8 6 | 5 ? 7. What is the missing number?
  24. 24.Magic trick! Think of 4. Double it, add 6, halve it, then take away 4. What number do you get?
  25. 25.9 × 9 = 8? — what is the missing digit?
  26. 26.29 × 4 =
  27. 27.Half of 198 =
  28. 28.A piggy bank has 2 coins of ₹5 and 6 coins of ₹2. How many rupees are in it?
  29. 29.9 × 2 = 1? — what is the missing digit?
  30. 30.1 + 2 + 3 + … + 18 =
  31. 31.11 × 11 =
  32. 32.Magic square (every row, column and diagonal has the same total): 14 9 10 | 7 ? 15 | 12 13 8. What is the missing number?
  33. 33.594 + 495 =
  34. 34.Magic square (every row, column and diagonal has the same total): 4 3 8 | 9 5 ? | 2 7 6. What is the missing number?
  35. 35.Magic square (every row, column and diagonal has the same total): 12 7 ? | 5 9 13 | 10 11 6. What is the missing number?
  36. 36.17 × 4 =
  37. 37.What comes next? 1, 4, 9, 16, ? (a) 23 (b) 26 (c) 27 (d) 25
  38. 38.853 × ? = 8530
  39. 39.9 × 9 =
  40. 40.5 × 9 =

Answer key

  1. 6
  2. 7
  3. 595
  4. 111
  5. 184
  6. 58
  7. 104
  8. 7
  9. 987654321
  10. 9
  11. 63
  12. 98765
  13. 36
  14. 13
  15. Thursday
  16. 6
  17. 1089
  18. 4
  19. 16
  20. 9400
  21. 90
  22. 1
  23. 12
  24. 3
  25. 1
  26. 116
  27. 99
  28. 22
  29. 8
  30. 171
  31. 121
  32. 11
  33. 1089
  34. 1
  35. 8
  36. 68
  37. 25
  38. 10
  39. 81
  40. 45

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