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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 964 · 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. 1.5 × 9 =
  2. 2.In 2 years a boy will be 14 years old. How old was he 3 years ago?
  3. 3.Magic square (every row, column and diagonal has the same total): 25 28 13 | ? 22 34 | 31 16 19. What is the missing number?
  4. 4.Double 79 =
  5. 5.1 + 2 + 3 + … + 16 =
  6. 6.The 6th of a month is a Monday. What day is the 27th of the same month? (a) Thursday (b) Sunday (c) Tuesday (d) Monday
  7. 7.7 × 4 =
  8. 8.9 × 3 =
  9. 9.A girl is 7 years old and her brother is 5 years older. How old will her brother be in 4 years?
  10. 10.9 × 6 = ?4 — what is the missing digit?
  11. 11.9 × 3 = 2? — what is the missing digit?
  12. 12.1 + 3 + 5 + … + 19 =
  13. 13.9 × 2 = 1? — what is the missing digit?
  14. 14.Do the 1089 trick with 330: reverse and subtract, then reverse that answer and add. What do you get?
  15. 15.The ages of two twins add up to 10. How old is each twin?
  16. 16.?52 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.1 + 2 + 3 + … + 42 =
  18. 18.1234567 × 9 + 8 =
  19. 19.12345678 × 9 + 9 =
  20. 20.9 × 5 = 4? — what is the missing digit?
  21. 21.If today is Tuesday, what day will it be after 12 days? (a) Saturday (b) Monday (c) Sunday (d) Wednesday
  22. 22.Half of 196 =
  23. 23.Half of 66 =
  24. 24.1 + 2 + 3 + … + 8 =
  25. 25.1 + 2 + 3 + … + 19 =
  26. 26.58 × 4 =
  27. 27.Half of 34 =
  28. 28.9 × 3 = ?7 — what is the missing digit?
  29. 29.If today is Tuesday, what day will it be after 18 days? (a) Tuesday (b) Saturday (c) Sunday (d) Friday
  30. 30.Half of 126 =
  31. 31.What comes next? 4, 8, 16, 32, ? (a) 48 (b) 64 (c) 56 (d) 65
  32. 32.1 × 9 =
  33. 33.38 × 1000 =
  34. 34.43 × 4 =
  35. 35.Half of 186 =
  36. 36.Magic square (every row, column and diagonal has the same total): 8 ? 10 | 13 11 9 | 12 7 14. What is the missing number?
  37. 37.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
  38. 38.Half of 32 =
  39. 39.Do the 1089 trick with 552: reverse and subtract, then reverse that answer and add. What do you get?
  40. 40.123456 × 8 + 6 =

Answer key

  1. 45
  2. 9
  3. 10
  4. 158
  5. 136
  6. Monday
  7. 28
  8. 27
  9. 16
  10. 5
  11. 7
  12. 100
  13. 8
  14. 1089
  15. 5
  16. 2
  17. 903
  18. 11111111
  19. 111111111
  20. 5
  21. Sunday
  22. 98
  23. 33
  24. 36
  25. 190
  26. 232
  27. 17
  28. 2
  29. Saturday
  30. 63
  31. 64
  32. 9
  33. 38000
  34. 172
  35. 93
  36. 15
  37. 495
  38. 16
  39. 1089
  40. 987654

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