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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 656 · 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 1 and then doubled it. I got 28. What was my number?
  2. 2.Magic trick! Think of 4. Double it, add 14, halve it, then take away 4. What number do you get?
  3. 3.122 × ? = 1220
  4. 4.9 × 9 = ?1 — what is the missing digit?
  5. 5.9 × 3 = ?7 — what is the missing digit?
  6. 6.10 × 9 =
  7. 7.I thought of a number, added 6 and then doubled it. I got 24. What was my number?
  8. 8.Take 356. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  9. 9.The 6th of a month is a Thursday. What day is the 14th of the same month? (a) Thursday (b) Saturday (c) Friday (d) Monday
  10. 10.12345679 × 27 =
  11. 11.Magic square (every row, column and diagonal has the same total): 17 32 ? | 14 20 26 | 29 8 23. What is the missing number?
  12. 12.9 × 3 = 2? — what is the missing digit?
  13. 13.Half of 78 =
  14. 14.28?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.9 × 9 = 8? — what is the missing digit?
  16. 16.7 × 9 =
  17. 17.8 × 100 =
  18. 18.1 + 3 + 5 + … + 11 =
  19. 19.Do the 1089 trick with 875: reverse and subtract, then reverse that answer and add. What do you get?
  20. 20.25 × 1000 =
  21. 21.63 × ? = 6300
  22. 22.30?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.If today is Saturday, what day was it 22 days ago? (a) Thursday (b) Saturday (c) Monday (d) Friday
  24. 24.38 × 4 =
  25. 25.Take 491. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  26. 26.9 × 3 =
  27. 27.20?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.12 × 9 + 3 =
  29. 29.Magic square (every row, column and diagonal has the same total): 12 22 20 | 26 18 10 | ? 14 24. What is the missing number?
  30. 30.Odd one out: which number is NOT in the 5 times table? (a) 40 (b) 24 (c) 25 (d) 10
  31. 31.Do the 1089 trick with 177: reverse and subtract, then reverse that answer and add. What do you get?
  32. 32.9 × 2 =
  33. 33.If today is Wednesday, what day will it be after 21 days? (a) Tuesday (b) Saturday (c) Wednesday (d) Thursday
  34. 34.32 × 100 =
  35. 35.Double 72 =
  36. 36.What comes next? 25, 36, 49, 64, ? (a) 82 (b) 79 (c) 83 (d) 81
  37. 37.423 × ? = 4230
  38. 38.22 × 1000 =
  39. 39.37 × 6 =
  40. 40.9 × 5 = 4? — what is the missing digit?

Answer key

  1. 13
  2. 7
  3. 10
  4. 8
  5. 2
  6. 90
  7. 6
  8. 297
  9. Friday
  10. 333333333
  11. 11
  12. 7
  13. 39
  14. 5
  15. 1
  16. 63
  17. 800
  18. 36
  19. 1089
  20. 25000
  21. 100
  22. 2
  23. Friday
  24. 152
  25. 297
  26. 27
  27. 2
  28. 111
  29. 16
  30. 24
  31. 1089
  32. 18
  33. Wednesday
  34. 3200
  35. 144
  36. 81
  37. 10
  38. 22000
  39. 222
  40. 5

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