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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 866 · 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 × 7 =
  2. 2.37 × 3 =
  3. 3.In 2 years a boy will be 15 years old. How old was he 3 years ago?
  4. 4.1 + 2 + 3 + … + 81 =
  5. 5.31 × 4 =
  6. 6.Magic square (every row, column and diagonal has the same total): 10 5 ? | 3 7 11 | 8 9 4. What is the missing number?
  7. 7.16 × 4 =
  8. 8.Double 84 =
  9. 9.9 × 9 =
  10. 10.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  11. 11.Half of 128 =
  12. 12.Half of 144 =
  13. 13.9 × 2 =
  14. 14.9 × 4 = ?6 — what is the missing digit?
  15. 15.5?36 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.Take 69 and take away the sum of its digits. What do you get?
  17. 17.7 × 4 =
  18. 18.1 + 2 + 3 + … + 38 =
  19. 19.4 × 9 =
  20. 20.45 × 4 =
  21. 21.30 × 4 =
  22. 22.Do the 1089 trick with 570: reverse and subtract, then reverse that answer and add. What do you get?
  23. 23.9 × 8 = 7? — what is the missing digit?
  24. 24.Odd one out: which number is NOT in the 9 times table? (a) 36 (b) 18 (c) 21 (d) 27
  25. 25.Magic square (every row, column and diagonal has the same total): 16 13 28 | 31 19 7 | 10 ? 22. What is the missing number?
  26. 26.62? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.If today is Monday, what day will it be after 42 days? (a) Tuesday (b) Sunday (c) Thursday (d) Monday
  28. 28.Magic square (every row, column and diagonal has the same total): 10 11 6 | 5 9 ? | 12 7 8. What is the missing number?
  29. 29.4 × ? = 4000
  30. 30.22 × ? = 2200
  31. 31.Magic square (every row, column and diagonal has the same total): 6 20 10 | ? 12 8 | 14 4 18. What is the missing number?
  32. 32.If today is Saturday, what day will it be after 15 days? (a) Saturday (b) Sunday (c) Wednesday (d) Monday
  33. 33.Do the 1089 trick with 580: reverse and subtract, then reverse that answer and add. What do you get?
  34. 34.5 × 100 =
  35. 35.907 × 10 =
  36. 36.9 × 1 =
  37. 37.41 × 4 =
  38. 38.9 × 6 = 5? — what is the missing digit?
  39. 39.Double 79 =
  40. 40.9 × 2 = 1? — what is the missing digit?

Answer key

  1. 63
  2. 111
  3. 10
  4. 3321
  5. 124
  6. 6
  7. 64
  8. 168
  9. 81
  10. 297
  11. 64
  12. 72
  13. 18
  14. 3
  15. 4
  16. 54
  17. 28
  18. 741
  19. 36
  20. 180
  21. 120
  22. 1089
  23. 2
  24. 21
  25. 25
  26. 1
  27. Monday
  28. 13
  29. 1000
  30. 100
  31. 16
  32. Sunday
  33. 1089
  34. 500
  35. 9070
  36. 9
  37. 164
  38. 4
  39. 158
  40. 8

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