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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 447 · 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.I thought of a number, added 8 and then doubled it. I got 26. What was my number?
  2. 2.A girl is 9 years old and her brother is 4 years older. How old will her brother be in 5 years?
  3. 3.8 × 4 =
  4. 4.Magic square (every row, column and diagonal has the same total): 7 21 11 | ? 13 9 | 15 5 19. What is the missing number?
  5. 5.64?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.2 × 9 =
  7. 7.22 × 4 =
  8. 8.495 + 594 =
  9. 9.I thought of a number, multiplied it by 4 and added 9. I got 29. What was my number?
  10. 10.Do the 1089 trick with 551: reverse and subtract, then reverse that answer and add. What do you get?
  11. 11.34 × 4 =
  12. 12.What comes next? 1, 2, 4, 8, ? (a) 12 (b) 16 (c) 17 (d) 14
  13. 13.9 × 2 = 1? — what is the missing digit?
  14. 14.Think of 7. Multiply it by 2, then add 4. What number do you end with?
  15. 15.Half of 102 =
  16. 16.Double 24 =
  17. 17.Magic square (every row, column and diagonal has the same total): 26 29 14 | 11 ? 35 | 32 17 20. What is the missing number?
  18. 18.1 + 3 + 5 + … + 19 =
  19. 19.37 × 6 =
  20. 20.A piggy bank has 12 coins of ₹5 and 11 coins of ₹2. How many rupees are in it?
  21. 21.Double 88 =
  22. 22.5?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.12345679 × 81 =
  24. 24.20 × 4 =
  25. 25.383 × ? = 3830
  26. 26.?15 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.54 × 4 =
  28. 28.Magic square (every row, column and diagonal has the same total): 10 8 ? | 20 12 4 | 6 16 14. What is the missing number?
  29. 29.1111 × 1111 =
  30. 30.What comes next? 4, 8, 16, 32, ? (a) 48 (b) 65 (c) 56 (d) 64
  31. 31.If today is Sunday, what day will it be after 81 days? (a) Wednesday (b) Thursday (c) Sunday (d) Friday
  32. 32.I thought of a number, added 3 and then doubled it. I got 24. What was my number?
  33. 33.9 × 4 =
  34. 34.What comes next? 4, 9, 16, 25, ? (a) 37 (b) 36 (c) 38 (d) 34
  35. 35.12 × 8 + 2 =
  36. 36.Magic square (every row, column and diagonal has the same total): 26 11 32 | 29 ? 17 | 14 35 20. What is the missing number?
  37. 37.What comes next? 36, 49, 64, 81, ? (a) 102 (b) 100 (c) 101 (d) 98
  38. 38.9 × 10 = ?0 — what is the missing digit?
  39. 39.12345678 × 9 + 9 =
  40. 40.Think of 12. Multiply it by 5, then add 5. What number do you end with?

Answer key

  1. 5
  2. 18
  3. 32
  4. 17
  5. 9
  6. 18
  7. 88
  8. 1089
  9. 5
  10. 1089
  11. 136
  12. 16
  13. 8
  14. 18
  15. 51
  16. 48
  17. 23
  18. 100
  19. 222
  20. 82
  21. 176
  22. 4
  23. 999999999
  24. 80
  25. 10
  26. 3
  27. 216
  28. 18
  29. 1234321
  30. 64
  31. Thursday
  32. 9
  33. 36
  34. 36
  35. 98
  36. 23
  37. 100
  38. 9
  39. 111111111
  40. 65

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