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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 220 · 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 × 5 = ?5 — what is the missing digit?
  2. 2.If today is Wednesday, what day was it 45 days ago? (a) Saturday (b) Monday (c) Sunday (d) Wednesday
  3. 3.1 + 2 + 3 + … + 83 =
  4. 4.Odd one out: which number is NOT in the 6 times table? (a) 30 (b) 35 (c) 24 (d) 12
  5. 5.693 + 396 =
  6. 6.9 × 6 = ?4 — what is the missing digit?
  7. 7.I thought of a number, added 2 and then doubled it. I got 18. What was my number?
  8. 8.88 × ? = 8800
  9. 9.27 × 4 =
  10. 10.9 × 3 = 2? — what is the missing digit?
  11. 11.20?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.What comes next? 25, 36, 49, 64, ? (a) 82 (b) 81 (c) 79 (d) 83
  13. 13.If today is Monday, what day was it 60 days ago? (a) Sunday (b) Wednesday (c) Thursday (d) Friday
  14. 14.Double 58 =
  15. 15.A father is 38 years old and his son is 6. How old was the father when the son was born?
  16. 16.Magic square (every row, column and diagonal has the same total): 12 27 24 | 33 ? 9 | 18 15 30. What is the missing number?
  17. 17.What comes next? 18, 23, 28, 33, ? (a) 39 (b) 38 (c) 43 (d) 33
  18. 18.12345678 × 9 + 9 =
  19. 19.9 × 8 = 7? — what is the missing digit?
  20. 20.30 × 4 =
  21. 21.1 + 2 + 3 + … + 96 =
  22. 22.Odd one out: which number is NOT in the 9 times table? (a) 29 (b) 45 (c) 54 (d) 18
  23. 23.1 + 3 + 5 + … + 15 =
  24. 24.12345679 × 81 =
  25. 25.802? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.The 5th of a month is a Sunday. What day is the 26th of the same month? (a) Monday (b) Saturday (c) Wednesday (d) Sunday
  27. 27.Magic trick! Think of 16. Double it, add 6, halve it, then take away 16. What number do you get?
  28. 28.The 9th of a month is a Tuesday. What day is the 19th of the same month? (a) Saturday (b) Thursday (c) Monday (d) Friday
  29. 29.18 × 4 =
  30. 30.1 + 2 + 3 + … + 20 =
  31. 31.?901 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.435? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Magic square (every row, column and diagonal has the same total): 8 18 4 | 6 10 14 | 16 ? 12. What is the missing number?
  34. 34.Take 83 and take away the sum of its digits. What do you get?
  35. 35.5?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.9 × 5 = 4? — what is the missing digit?
  37. 37.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
  38. 38.37 × 3 =
  39. 39.175 × 10 =
  40. 40.759 × 10 =

Answer key

  1. 4
  2. Sunday
  3. 3486
  4. 35
  5. 1089
  6. 5
  7. 7
  8. 100
  9. 108
  10. 7
  11. 5
  12. 81
  13. Thursday
  14. 116
  15. 32
  16. 21
  17. 38
  18. 111111111
  19. 2
  20. 120
  21. 4656
  22. 29
  23. 64
  24. 999999999
  25. 8
  26. Sunday
  27. 3
  28. Friday
  29. 72
  30. 210
  31. 8
  32. 6
  33. 2
  34. 72
  35. 3
  36. 5
  37. 495
  38. 111
  39. 1750
  40. 7590

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