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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 986 · 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. 1.504 × ? = 5040
  2. 2.I thought of a number, added 2 and then doubled it. I got 20. What was my number?
  3. 3.What comes next? 14, 17, 20, 23, ? (a) 26 (b) 23 (c) 29 (d) 27
  4. 4.If today is Tuesday, what day will it be after 85 days? (a) Wednesday (b) Thursday (c) Tuesday (d) Saturday
  5. 5.Double 21 =
  6. 6.7 × 1000 =
  7. 7.7?42 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.9 × 3 = 2? — what is the missing digit?
  9. 9.1 + 2 + 3 + … + 16 =
  10. 10.In 5 years a boy will be 17 years old. How old was he 4 years ago?
  11. 11.9 × 6 = 5? — what is the missing digit?
  12. 12.1111 × 1111 =
  13. 13.Double 93 =
  14. 14.Do the 1089 trick with 366: reverse and subtract, then reverse that answer and add. What do you get?
  15. 15.12 × 4 =
  16. 16.Magic square (every row, column and diagonal has the same total): 9 ? 11 | 10 8 6 | 5 12 7. What is the missing number?
  17. 17.A father is 32 years old and his son is 12. How old was the father when the son was born?
  18. 18.195 × 10 =
  19. 19.48 × 100 =
  20. 20.1 × 9 =
  21. 21.Double 71 =
  22. 22.Magic square (every row, column and diagonal has the same total): 17 19 9 | 7 ? 23 | 21 11 13. What is the missing number?
  23. 23.The ages of two twins add up to 18. How old is each twin?
  24. 24.9 × 1 =
  25. 25.Double 54 =
  26. 26.Double 67 =
  27. 27.9 × 9 = 8? — what is the missing digit?
  28. 28.47 × 4 =
  29. 29.8 × 9 =
  30. 30.28 × 100 =
  31. 31.12345679 × 27 =
  32. 32.Odd one out: which number is NOT in the 7 times table? (a) 14 (b) 60 (c) 21 (d) 35
  33. 33.43 × 4 =
  34. 34.Double 87 =
  35. 35.420 × 10 =
  36. 36.11111 × 11111 =
  37. 37.37 × 6 =
  38. 38.1 + 2 + 3 + … + 27 =
  39. 39.9 × 2 = ?8 — what is the missing digit?
  40. 40.34 × 4 =

Answer key

  1. 10
  2. 8
  3. 26
  4. Wednesday
  5. 42
  6. 7000
  7. 5
  8. 7
  9. 136
  10. 8
  11. 4
  12. 1234321
  13. 186
  14. 1089
  15. 48
  16. 4
  17. 20
  18. 1950
  19. 4800
  20. 9
  21. 142
  22. 15
  23. 9
  24. 9
  25. 108
  26. 134
  27. 1
  28. 188
  29. 72
  30. 2800
  31. 333333333
  32. 60
  33. 172
  34. 174
  35. 4200
  36. 123454321
  37. 222
  38. 378
  39. 1
  40. 136

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