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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 954 · 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. 1.51 × 4 =
  2. 2.Double 61 =
  3. 3.Double 16 =
  4. 4.In 6 years a boy will be 16 years old. How old was he 5 years ago?
  5. 5.1 + 2 + 3 + … + 15 =
  6. 6.12345679 × 45 =
  7. 7.495 + 594 =
  8. 8.37 × 9 =
  9. 9.Magic square (every row, column and diagonal has the same total): 10 25 22 | 31 19 7 | ? 13 28. What is the missing number?
  10. 10.Do the 1089 trick with 610: reverse and subtract, then reverse that answer and add. What do you get?
  11. 11.7 × 9 =
  12. 12.36 × ? = 36000
  13. 13.What comes next? 13, 16, 19, 22, ? (a) 28 (b) 25 (c) 22 (d) 26
  14. 14.31 × 4 =
  15. 15.569 × 10 =
  16. 16.9 × 3 = ?7 — what is the missing digit?
  17. 17.1 + 3 + 5 + … + 45 =
  18. 18.Half of 156 =
  19. 19.What comes next? 16, 25, 36, 49, ? (a) 65 (b) 64 (c) 62 (d) 66
  20. 20.Double 81 =
  21. 21.The ages of two twins add up to 18. How old is each twin?
  22. 22.30 × 4 =
  23. 23.2 × 9 =
  24. 24.258 × 10 =
  25. 25.?187 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.9 × 4 = 3? — what is the missing digit?
  27. 27.If today is Friday, what day was it 50 days ago? (a) Thursday (b) Wednesday (c) Sunday (d) Friday
  28. 28.I thought of a number, added 7 and then doubled it. I got 26. What was my number?
  29. 29.Do the 1089 trick with 327: reverse and subtract, then reverse that answer and add. What do you get?
  30. 30.19 × 4 =
  31. 31.44 × 4 =
  32. 32.297 + 792 =
  33. 33.60 × 100 =
  34. 34.Take 76 and take away the sum of its digits. What do you get?
  35. 35.1 + 3 + 5 + … + 9 =
  36. 36.I thought of a number, added 2 and then doubled it. I got 14. What was my number?
  37. 37.45 × 4 =
  38. 38.37 × 24 =
  39. 39.1 + 2 + 3 + … + 82 =
  40. 40.?182 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

  1. 204
  2. 122
  3. 32
  4. 5
  5. 120
  6. 555555555
  7. 1089
  8. 333
  9. 16
  10. 1089
  11. 63
  12. 1000
  13. 25
  14. 124
  15. 5690
  16. 2
  17. 529
  18. 78
  19. 64
  20. 162
  21. 9
  22. 120
  23. 18
  24. 2580
  25. 2
  26. 6
  27. Thursday
  28. 6
  29. 1089
  30. 76
  31. 176
  32. 1089
  33. 6000
  34. 63
  35. 25
  36. 5
  37. 180
  38. 888
  39. 3403
  40. 7

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