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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 989 · 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. 1.9 × 4 = ?6 — what is the missing digit?
  2. 2.The 9th of a month is a Sunday. What day is the 29th of the same month? (a) Friday (b) Sunday (c) Tuesday (d) Saturday
  3. 3.Do the 1089 trick with 920: reverse and subtract, then reverse that answer and add. What do you get?
  4. 4.1 + 3 + 5 + … + 25 =
  5. 5.37 × 9 =
  6. 6.7 × 9 =
  7. 7.Do the 1089 trick with 830: reverse and subtract, then reverse that answer and add. What do you get?
  8. 8.37 × 4 =
  9. 9.Odd one out: which number is NOT in the 9 times table? (a) 41 (b) 45 (c) 18 (d) 27
  10. 10.Think of 9. Multiply it by 2, then add 9. What number do you end with?
  11. 11.7 × 4 =
  12. 12.50 × 4 =
  13. 13.Magic trick! Think of 13. Double it, add 12, halve it, then take away 13. What number do you get?
  14. 14.A father is 43 years old and his son is 10. How old was the father when the son was born?
  15. 15.398? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.1 + 2 + 3 + … + 88 =
  17. 17.50 × 1000 =
  18. 18.Magic square (every row, column and diagonal has the same total): 17 14 29 | 32 ? 8 | 11 26 23. What is the missing number?
  19. 19.9 × 3 =
  20. 20.Magic square (every row, column and diagonal has the same total): 26 ? 14 | 11 23 35 | 32 17 20. What is the missing number?
  21. 21.?565 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.9 × 2 = 1? — what is the missing digit?
  23. 23.1 + 2 + 3 + … + 99 =
  24. 24.9 × 9 = 8? — what is the missing digit?
  25. 25.52 × 4 =
  26. 26.44 × 1000 =
  27. 27.9 × 6 = 5? — what is the missing digit?
  28. 28.1 + 2 + 3 + … + 68 =
  29. 29.Think of 5. Multiply it by 4, then add 6. What number do you end with?
  30. 30.7 × 100 =
  31. 31.25 × 4 =
  32. 32.I thought of a number, added 4 and then doubled it. I got 38. What was my number?
  33. 33.9 × 4 = 3? — what is the missing digit?
  34. 34.28 × 4 =
  35. 35.What comes next? 16, 25, 36, 49, ? (a) 65 (b) 62 (c) 64 (d) 66
  36. 36.Half of 96 =
  37. 37.9 × 7 = 6? — what is the missing digit?
  38. 38.12345679 × 36 =
  39. 39.123 × 8 + 3 =
  40. 40.In 5 years a boy will be 13 years old. How old was he 2 years ago?

Answer key

  1. 3
  2. Saturday
  3. 1089
  4. 169
  5. 333
  6. 63
  7. 1089
  8. 148
  9. 41
  10. 27
  11. 28
  12. 200
  13. 6
  14. 33
  15. 7
  16. 3916
  17. 50000
  18. 20
  19. 27
  20. 29
  21. 2
  22. 8
  23. 4950
  24. 1
  25. 208
  26. 44000
  27. 4
  28. 2346
  29. 26
  30. 700
  31. 100
  32. 15
  33. 6
  34. 112
  35. 64
  36. 48
  37. 3
  38. 444444444
  39. 987
  40. 6

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