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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 666 · 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. 1.35 × 4 =
  2. 2.Take 99 and take away the sum of its digits. What do you get?
  3. 3.349? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.9 × 7 =
  5. 5.The 6th of a month is a Tuesday. What day is the 22nd of the same month? (a) Sunday (b) Wednesday (c) Thursday (d) Friday
  6. 6.37 × 3 =
  7. 7.1 × 9 =
  8. 8.In 2 years a boy will be 11 years old. How old was he 4 years ago?
  9. 9.12 × 4 =
  10. 10.If today is Saturday, what day will it be after 27 days? (a) Saturday (b) Friday (c) Thursday (d) Monday
  11. 11.If today is Tuesday, what day will it be after 82 days? (a) Wednesday (b) Saturday (c) Sunday (d) Monday
  12. 12.1111 × 1111 =
  13. 13.792 + 297 =
  14. 14.111 × 111 =
  15. 15.123456 × 8 + 6 =
  16. 16.3 × ? = 3000
  17. 17.9 × 8 = ?2 — what is the missing digit?
  18. 18.1 + 3 + 5 + … + 17 =
  19. 19.594 + 495 =
  20. 20.43 × 4 =
  21. 21.27 × ? = 27000
  22. 22.Think of 4. Multiply it by 4, then add 8. What number do you end with?
  23. 23.53 × 4 =
  24. 24.9 × 10 =
  25. 25.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
  26. 26.Half of 194 =
  27. 27.37 × 27 =
  28. 28.1 + 2 + 3 + … + 45 =
  29. 29.11 × 11 =
  30. 30.9 × 5 = ?5 — what is the missing digit?
  31. 31.123 × 8 + 3 =
  32. 32.Magic square (every row, column and diagonal has the same total): 12 26 16 | 22 18 14 | ? 10 24. What is the missing number?
  33. 33.In 3 years a boy will be 16 years old. How old was he 3 years ago?
  34. 34.123456 × 9 + 7 =
  35. 35.37 × 4 =
  36. 36.In 2 years a boy will be 13 years old. How old was he 2 years ago?
  37. 37.77 × 100 =
  38. 38.979 × 10 =
  39. 39.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
  40. 40.1 + 2 + 3 + … + 30 =

Answer key

  1. 140
  2. 81
  3. 2
  4. 63
  5. Thursday
  6. 111
  7. 9
  8. 5
  9. 48
  10. Friday
  11. Sunday
  12. 1234321
  13. 1089
  14. 12321
  15. 987654
  16. 1000
  17. 7
  18. 81
  19. 1089
  20. 172
  21. 1000
  22. 24
  23. 212
  24. 90
  25. 792
  26. 97
  27. 999
  28. 1035
  29. 121
  30. 4
  31. 987
  32. 20
  33. 10
  34. 1111111
  35. 148
  36. 9
  37. 7700
  38. 9790
  39. 198
  40. 465

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