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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 361 · 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. 1.58 × 4 =
  2. 2.What comes next? 1, 8, 15, 22, ? (a) 30 (b) 36 (c) 29 (d) 22
  3. 3.9 × 2 = ?8 — what is the missing digit?
  4. 4.Half of 86 =
  5. 5.9 × 3 =
  6. 6.28 × 4 =
  7. 7.I thought of a number, added 8 and then doubled it. I got 38. What was my number?
  8. 8.Magic square (every row, column and diagonal has the same total): 24 3 18 | ? 15 21 | 12 27 6. What is the missing number?
  9. 9.54 × 4 =
  10. 10.If today is Wednesday, what day will it be after 37 days? (a) Saturday (b) Thursday (c) Friday (d) Monday
  11. 11.123456 × 8 + 6 =
  12. 12.11111 × 11111 =
  13. 13.Take 81 and take away the sum of its digits. What do you get?
  14. 14.What comes next? 16, 25, 36, 49, ? (a) 66 (b) 64 (c) 62 (d) 65
  15. 15.What comes next? 8, 11, 14, 17, ? (a) 21 (b) 17 (c) 23 (d) 20
  16. 16.2 × 9 =
  17. 17.Double 66 =
  18. 18.I thought of a number, multiplied it by 3 and added 5. I got 29. What was my number?
  19. 19.1 + 2 + 3 + … + 26 =
  20. 20.Do the 1089 trick with 428: reverse and subtract, then reverse that answer and add. What do you get?
  21. 21.?065 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.626 × ? = 6260
  23. 23.Magic square (every row, column and diagonal has the same total): 18 4 14 | 8 12 16 | 10 20 ?. What is the missing number?
  24. 24.7 × 4 =
  25. 25.11 × 11 =
  26. 26.A girl is 6 years old and her brother is 5 years older. How old will her brother be in 4 years?
  27. 27.43 × 4 =
  28. 28.If today is Wednesday, what day will it be after 45 days? (a) Sunday (b) Friday (c) Tuesday (d) Saturday
  29. 29.9 × 5 = 4? — what is the missing digit?
  30. 30.6 × 4 =
  31. 31.Magic square (every row, column and diagonal has the same total): 24 10 ? | 14 18 22 | 16 26 12. What is the missing number?
  32. 32.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
  33. 33.In 6 years a boy will be 15 years old. How old was he 2 years ago?
  34. 34.9 × 5 = ?5 — what is the missing digit?
  35. 35.6 × 9 =
  36. 36.Magic square (every row, column and diagonal has the same total): ? 21 11 | 17 13 9 | 15 5 19. What is the missing number?
  37. 37.?015 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.792 + 297 =
  39. 39.12 × 8 + 2 =
  40. 40.10 × 9 =

Answer key

  1. 232
  2. 29
  3. 1
  4. 43
  5. 27
  6. 112
  7. 11
  8. 9
  9. 216
  10. Friday
  11. 987654
  12. 123454321
  13. 72
  14. 64
  15. 20
  16. 18
  17. 132
  18. 8
  19. 351
  20. 1089
  21. 7
  22. 10
  23. 6
  24. 28
  25. 121
  26. 15
  27. 172
  28. Saturday
  29. 5
  30. 24
  31. 20
  32. 594
  33. 7
  34. 4
  35. 54
  36. 7
  37. 3
  38. 1089
  39. 98
  40. 90

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