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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 729 · 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.?012 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.1 + 2 + 3 + … + 31 =
  3. 3.Magic square (every row, column and diagonal has the same total): 17 ? 11 | 14 20 26 | 29 8 23. What is the missing number?
  4. 4.What comes next? 16, 19, 22, 25, ? (a) 29 (b) 31 (c) 25 (d) 28
  5. 5.9 × 5 =
  6. 6.27 × 1000 =
  7. 7.65 × ? = 6500
  8. 8.Take 870. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  9. 9.189 × 10 =
  10. 10.I thought of a number, multiplied it by 2 and added 8. I got 26. What was my number?
  11. 11.Half of 46 =
  12. 12.I thought of a number, multiplied it by 3 and added 2. I got 41. What was my number?
  13. 13.1 × 9 =
  14. 14.If today is Sunday, what day was it 16 days ago? (a) Saturday (b) Thursday (c) Friday (d) Monday
  15. 15.Think of 14. Multiply it by 3, then add 4. What number do you end with?
  16. 16.1111 × 1111 =
  17. 17.9 × 10 = 9? — what is the missing digit?
  18. 18.204? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.9 × 4 =
  20. 20.Think of 3. Multiply it by 3, then add 1. What number do you end with?
  21. 21.9 × 4 = 3? — what is the missing digit?
  22. 22.?92 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Double 62 =
  24. 24.1 + 2 + 3 + … + 41 =
  25. 25.9 × 10 = ?0 — what is the missing digit?
  26. 26.12345679 × 18 =
  27. 27.5 × 9 =
  28. 28.Half of 112 =
  29. 29.Magic square (every row, column and diagonal has the same total): 8 ? 12 | 13 9 5 | 6 11 10. What is the missing number?
  30. 30.63 × 100 =
  31. 31.1234567 × 9 + 8 =
  32. 32.Magic trick! Think of 2. Double it, add 8, halve it, then take away 2. What number do you get?
  33. 33.209 × 10 =
  34. 34.1 + 2 + 3 + … + 20 =
  35. 35.1 + 2 + 3 + … + 26 =
  36. 36.4 × 9 =
  37. 37.Magic square (every row, column and diagonal has the same total): 27 6 21 | 12 ? 24 | 15 30 9. What is the missing number?
  38. 38.I thought of a number, added 2 and then doubled it. I got 40. What was my number?
  39. 39.9 × 4 = ?6 — what is the missing digit?
  40. 40.9 × 2 =

Answer key

  1. 6
  2. 496
  3. 32
  4. 28
  5. 45
  6. 27000
  7. 100
  8. 792
  9. 1890
  10. 9
  11. 23
  12. 13
  13. 9
  14. Friday
  15. 46
  16. 1234321
  17. 0
  18. 3
  19. 36
  20. 10
  21. 6
  22. 7
  23. 124
  24. 861
  25. 9
  26. 222222222
  27. 45
  28. 56
  29. 7
  30. 6300
  31. 11111111
  32. 4
  33. 2090
  34. 210
  35. 351
  36. 36
  37. 18
  38. 18
  39. 3
  40. 18

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