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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 251 · 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 × 1 =
  2. 2.2?39 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.1 + 2 + 3 + … + 69 =
  4. 4.The 9th of a month is a Wednesday. What day is the 21st of the same month? (a) Sunday (b) Tuesday (c) Monday (d) Thursday
  5. 5.If today is Thursday, what day will it be after 10 days? (a) Sunday (b) Wednesday (c) Saturday (d) Monday
  6. 6.Magic square (every row, column and diagonal has the same total): 13 12 17 | ? 14 10 | 11 16 15. What is the missing number?
  7. 7.1 × 9 =
  8. 8.The 5th of a month is a Sunday. What day is the 19th of the same month? (a) Saturday (b) Monday (c) Sunday (d) Wednesday
  9. 9.4?42 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.9 × 9 =
  11. 11.I thought of a number, added 7 and then doubled it. I got 28. What was my number?
  12. 12.9 × 7 =
  13. 13.Double 29 =
  14. 14.2?70 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 21 and take away the sum of its digits. What do you get?
  16. 16.Do the 1089 trick with 390: reverse and subtract, then reverse that answer and add. What do you get?
  17. 17.In 6 years a boy will be 20 years old. How old was he 2 years ago?
  18. 18.9 × 9 = ?1 — what is the missing digit?
  19. 19.9 × 3 = ?7 — what is the missing digit?
  20. 20.15 × ? = 15000
  21. 21.Take 439. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  22. 22.In 4 years a boy will be 12 years old. How old was he 2 years ago?
  23. 23.27 × 4 =
  24. 24.The 8th of a month is a Saturday. What day is the 20th of the same month? (a) Wednesday (b) Thursday (c) Sunday (d) Friday
  25. 25.6?08 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Double 76 =
  27. 27.A father is 30 years old and his son is 14. How old was the father when the son was born?
  28. 28.What comes next? 3, 12, 21, 30, ? (a) 30 (b) 40 (c) 39 (d) 48
  29. 29.11 × 11 =
  30. 30.Magic square (every row, column and diagonal has the same total): 13 34 19 | 28 22 16 | ? 10 31. What is the missing number?
  31. 31.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  32. 32.1 + 2 + 3 + … + 26 =
  33. 33.9 × 5 =
  34. 34.I thought of a number, multiplied it by 4 and added 4. I got 16. What was my number?
  35. 35.Magic square (every row, column and diagonal has the same total): 19 ? 11 | 5 13 21 | 15 17 7. What is the missing number?
  36. 36.What comes next? 16, 25, 36, 49, ? (a) 66 (b) 65 (c) 64 (d) 62
  37. 37.Magic square (every row, column and diagonal has the same total): 13 8 15 | ? 12 10 | 9 16 11. What is the missing number?
  38. 38.Double 84 =
  39. 39.12345678 × 9 + 9 =
  40. 40.3?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

  1. 9
  2. 4
  3. 2415
  4. Monday
  5. Sunday
  6. 18
  7. 9
  8. Sunday
  9. 8
  10. 81
  11. 7
  12. 63
  13. 58
  14. 9
  15. 18
  16. 1089
  17. 12
  18. 8
  19. 2
  20. 1000
  21. 495
  22. 6
  23. 108
  24. Thursday
  25. 4
  26. 152
  27. 16
  28. 39
  29. 121
  30. 25
  31. 297
  32. 351
  33. 45
  34. 3
  35. 9
  36. 64
  37. 14
  38. 168
  39. 111111111
  40. 9

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