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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 172 · 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. 1.37 × 12 =
  2. 2.1 × 9 =
  3. 3.1 + 2 + 3 + … + 27 =
  4. 4.1 + 2 + 3 + … + 8 =
  5. 5.A father is 37 years old and his son is 8. How old was the father when the son was born?
  6. 6.Magic square (every row, column and diagonal has the same total): ? 29 8 | 11 17 23 | 26 5 20. What is the missing number?
  7. 7.What comes next? 4, 6, 8, 10, ? (a) 12 (b) 10 (c) 13 (d) 14
  8. 8.46? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.9 × 8 = ?2 — what is the missing digit?
  10. 10.1 + 2 + 3 + … + 25 =
  11. 11.I thought of a number, multiplied it by 5 and added 8. I got 33. What was my number?
  12. 12.Double 81 =
  13. 13.1 + 3 + 5 + … + 15 =
  14. 14.Magic square (every row, column and diagonal has the same total): 15 13 23 | ? 17 9 | 11 21 19. What is the missing number?
  15. 15.34 × ? = 34000
  16. 16.Half of 22 =
  17. 17.22 × 4 =
  18. 18.32 × 4 =
  19. 19.Think of 3. Multiply it by 3, then add 2. What number do you end with?
  20. 20.If today is Thursday, what day was it 54 days ago? (a) Sunday (b) Tuesday (c) Friday (d) Saturday
  21. 21.Do the 1089 trick with 991: reverse and subtract, then reverse that answer and add. What do you get?
  22. 22.342 × ? = 3420
  23. 23.Take 75 and take away the sum of its digits. What do you get?
  24. 24.6 × 9 =
  25. 25.Think of 2. Multiply it by 3, then add 5. What number do you end with?
  26. 26.In 4 years a boy will be 17 years old. How old was he 7 years ago?
  27. 27.If today is Sunday, what day will it be after 68 days? (a) Saturday (b) Monday (c) Thursday (d) Friday
  28. 28.If today is Monday, what day will it be after 30 days? (a) Wednesday (b) Thursday (c) Tuesday (d) Saturday
  29. 29.8 × 4 =
  30. 30.Take 56 and take away the sum of its digits. What do you get?
  31. 31.1 + 2 + 3 + … + 15 =
  32. 32.94 × 100 =
  33. 33.Half of 98 =
  34. 34.What comes next? 13, 18, 23, 28, ? (a) 33 (b) 38 (c) 28 (d) 34
  35. 35.77?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.If today is Thursday, what day will it be after 95 days? (a) Sunday (b) Thursday (c) Tuesday (d) Monday
  37. 37.Half of 176 =
  38. 38.1111 × 1111 =
  39. 39.What comes next? 19, 28, 37, 46, ? (a) 46 (b) 56 (c) 55 (d) 64
  40. 40.Double 34 =

Answer key

  1. 444
  2. 9
  3. 378
  4. 36
  5. 29
  6. 14
  7. 12
  8. 8
  9. 7
  10. 325
  11. 5
  12. 162
  13. 64
  14. 25
  15. 1000
  16. 11
  17. 88
  18. 128
  19. 11
  20. Saturday
  21. 1089
  22. 10
  23. 63
  24. 54
  25. 11
  26. 6
  27. Friday
  28. Wednesday
  29. 32
  30. 45
  31. 120
  32. 9400
  33. 49
  34. 33
  35. 4
  36. Monday
  37. 88
  38. 1234321
  39. 55
  40. 68

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