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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 458 · 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. 1.1 + 2 + 3 + … + 72 =
  2. 2.52?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.Magic square (every row, column and diagonal has the same total): 23 26 11 | 8 20 ? | 29 14 17. What is the missing number?
  4. 4.693 + 396 =
  5. 5.9 × 1 =
  6. 6.The 5th of a month is a Friday. What day is the 20th of the same month? (a) Sunday (b) Tuesday (c) Friday (d) Saturday
  7. 7.50 × 4 =
  8. 8.Half of 22 =
  9. 9.80 × 10 =
  10. 10.1 + 2 + 3 + … + 93 =
  11. 11.1 + 3 + 5 + … + 9 =
  12. 12.Magic trick! Think of 9. Double it, add 6, halve it, then take away 9. What number do you get?
  13. 13.What comes next? 1, 2, 4, 8, ? (a) 17 (b) 12 (c) 16 (d) 14
  14. 14.Double 62 =
  15. 15.21 × 4 =
  16. 16.Magic square (every row, column and diagonal has the same total): 10 5 6 | 3 7 ? | 8 9 4. What is the missing number?
  17. 17.20?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.Half of 142 =
  19. 19.8?28 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.10 × 9 =
  21. 21.Magic square (every row, column and diagonal has the same total): 11 16 9 | ? 12 14 | 15 8 13. What is the missing number?
  22. 22.53 × 4 =
  23. 23.9 × 4 = 3? — what is the missing digit?
  24. 24.In 5 years a boy will be 13 years old. How old was he 3 years ago?
  25. 25.28 × 4 =
  26. 26.9 × 3 =
  27. 27.I thought of a number, added 2 and then doubled it. I got 28. What was my number?
  28. 28.5 × 9 =
  29. 29.Do the 1089 trick with 690: reverse and subtract, then reverse that answer and add. What do you get?
  30. 30.Half of 122 =
  31. 31.The 7th of a month is a Friday. What day is the 19th of the same month? (a) Tuesday (b) Saturday (c) Wednesday (d) Thursday
  32. 32.Think of 10. Multiply it by 2, then add 2. What number do you end with?
  33. 33.12345678 × 9 + 9 =
  34. 34.642 × ? = 6420
  35. 35.12345679 × 18 =
  36. 36.40 × 1000 =
  37. 37.86 × 100 =
  38. 38.3 × 9 =
  39. 39.9 × 2 = 1? — what is the missing digit?
  40. 40.Double 78 =

Answer key

  1. 2628
  2. 7
  3. 32
  4. 1089
  5. 9
  6. Saturday
  7. 200
  8. 11
  9. 800
  10. 4371
  11. 25
  12. 3
  13. 16
  14. 124
  15. 84
  16. 11
  17. 7
  18. 71
  19. 9
  20. 90
  21. 10
  22. 212
  23. 6
  24. 5
  25. 112
  26. 27
  27. 12
  28. 45
  29. 1089
  30. 61
  31. Wednesday
  32. 22
  33. 111111111
  34. 10
  35. 222222222
  36. 40000
  37. 8600
  38. 27
  39. 8
  40. 156

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