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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 291 · 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.What comes next? 20, 23, 26, 29, ? (a) 33 (b) 32 (c) 35 (d) 29
  2. 2.1 + 2 + 3 + … + 37 =
  3. 3.766? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.1 + 2 + 3 + … + 70 =
  5. 5.7 × 9 =
  6. 6.45 × 1000 =
  7. 7.1 + 2 + 3 + … + 56 =
  8. 8.1 + 2 + 3 + … + 61 =
  9. 9.9 × 2 = ?8 — what is the missing digit?
  10. 10.1 + 2 + 3 + … + 58 =
  11. 11.53 × 100 =
  12. 12.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  13. 13.If today is Friday, what day will it be after 73 days? (a) Monday (b) Sunday (c) Tuesday (d) Thursday
  14. 14.Take 13 and take away the sum of its digits. What do you get?
  15. 15.12345 × 8 + 5 =
  16. 16.50 × 4 =
  17. 17.2?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.1 + 3 + 5 + … + 19 =
  19. 19.If today is Friday, what day will it be after 31 days? (a) Tuesday (b) Monday (c) Sunday (d) Thursday
  20. 20.Double 42 =
  21. 21.Magic square (every row, column and diagonal has the same total): 9 8 13 | 14 10 6 | 7 ? 11. What is the missing number?
  22. 22.37 × 4 =
  23. 23.9 × 6 = 5? — what is the missing digit?
  24. 24.Do the 1089 trick with 209: reverse and subtract, then reverse that answer and add. What do you get?
  25. 25.Double 77 =
  26. 26.24 × 4 =
  27. 27.I thought of a number, multiplied it by 2 and added 1. I got 15. What was my number?
  28. 28.Odd one out: which number is NOT in the 8 times table? (a) 24 (b) 19 (c) 40 (d) 64
  29. 29.Odd one out: which number is NOT in the 5 times table? (a) 37 (b) 20 (c) 15 (d) 10
  30. 30.Magic trick! Think of 12. Double it, add 6, halve it, then take away 12. What number do you get?
  31. 31.Think of 14. Multiply it by 5, then add 7. What number do you end with?
  32. 32.A girl is 11 years old and her brother is 4 years older. How old will her brother be in 4 years?
  33. 33.9 × 7 = ?3 — what is the missing digit?
  34. 34.111 × 111 =
  35. 35.1 + 3 + 5 + … + 33 =
  36. 36.If today is Saturday, what day will it be after 93 days? (a) Monday (b) Sunday (c) Tuesday (d) Thursday
  37. 37.Double 52 =
  38. 38.Half of 122 =
  39. 39.Double 81 =
  40. 40.Half of 162 =

Answer key

  1. 32
  2. 703
  3. 8
  4. 2485
  5. 63
  6. 45000
  7. 1596
  8. 1891
  9. 1
  10. 1711
  11. 5300
  12. 297
  13. Monday
  14. 9
  15. 98765
  16. 200
  17. 5
  18. 100
  19. Monday
  20. 84
  21. 12
  22. 148
  23. 4
  24. 1089
  25. 154
  26. 96
  27. 7
  28. 19
  29. 37
  30. 3
  31. 77
  32. 19
  33. 6
  34. 12321
  35. 289
  36. Monday
  37. 104
  38. 61
  39. 162
  40. 81

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