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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 707 · 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.If today is Friday, what day was it 47 days ago? (a) Wednesday (b) Monday (c) Saturday (d) Sunday
  2. 2.If today is Friday, what day was it 45 days ago? (a) Tuesday (b) Wednesday (c) Friday (d) Monday
  3. 3.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
  4. 4.9 × 7 = ?3 — what is the missing digit?
  5. 5.I thought of a number, multiplied it by 2 and added 5. I got 23. What was my number?
  6. 6.843? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.What comes next? 12, 14, 16, 18, ? (a) 21 (b) 22 (c) 20 (d) 18
  8. 8.9 × 6 = 5? — what is the missing digit?
  9. 9.221 × ? = 2210
  10. 10.Half of 116 =
  11. 11.123456 × 8 + 6 =
  12. 12.?533 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.9 × 10 = 9? — what is the missing digit?
  14. 14.10 × 9 =
  15. 15.Take 89 and take away the sum of its digits. What do you get?
  16. 16.1234 × 8 + 4 =
  17. 17.Take 19 and take away the sum of its digits. What do you get?
  18. 18.Magic trick! Think of 7. Double it, add 4, halve it, then take away 7. What number do you get?
  19. 19.525 × ? = 5250
  20. 20.9 × 2 = ?8 — what is the missing digit?
  21. 21.1 + 2 + 3 + … + 56 =
  22. 22.29 × 4 =
  23. 23.If today is Wednesday, what day will it be after 8 days? (a) Wednesday (b) Thursday (c) Sunday (d) Friday
  24. 24.Double 37 =
  25. 25.9 × 5 = 4? — what is the missing digit?
  26. 26.Take 187. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  27. 27.4?20 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.9 × 3 = 2? — what is the missing digit?
  29. 29.9 × 2 = 1? — what is the missing digit?
  30. 30.24 × ? = 2400
  31. 31.Magic square (every row, column and diagonal has the same total): 32 11 26 | 17 23 29 | 20 ? 14. What is the missing number?
  32. 32.Magic square (every row, column and diagonal has the same total): 14 9 10 | 7 11 15 | 12 13 ?. What is the missing number?
  33. 33.9 × 6 = ?4 — what is the missing digit?
  34. 34.12 × 8 + 2 =
  35. 35.37 × 27 =
  36. 36.Magic square (every row, column and diagonal has the same total): 5 ? 7 | 10 8 6 | 9 4 11. What is the missing number?
  37. 37.What comes next? 3, 6, 12, 24, ? (a) 49 (b) 42 (c) 36 (d) 48
  38. 38.15 × 4 =
  39. 39.57 × 4 =
  40. 40.37 × 9 =

Answer key

  1. Sunday
  2. Tuesday
  3. 891
  4. 6
  5. 9
  6. 3
  7. 20
  8. 4
  9. 10
  10. 58
  11. 987654
  12. 7
  13. 0
  14. 90
  15. 72
  16. 9876
  17. 9
  18. 2
  19. 10
  20. 1
  21. 1596
  22. 116
  23. Thursday
  24. 74
  25. 5
  26. 594
  27. 3
  28. 7
  29. 8
  30. 100
  31. 35
  32. 8
  33. 5
  34. 98
  35. 999
  36. 12
  37. 48
  38. 60
  39. 228
  40. 333

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