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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 905 · 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.?905 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.9 × 9 =
  3. 3.55 × 4 =
  4. 4.1 + 2 + 3 + … + 81 =
  5. 5.9 × 7 = 6? — what is the missing digit?
  6. 6.Magic square (every row, column and diagonal has the same total): 16 2 12 | 6 10 14 | ? 18 4. What is the missing number?
  7. 7.123456 × 8 + 6 =
  8. 8.12345679 × 81 =
  9. 9.Half of 16 =
  10. 10.4 × 9 =
  11. 11.Magic trick! Think of 19. Double it, add 16, halve it, then take away 19. What number do you get?
  12. 12.What comes next? 1, 4, 9, 16, ? (a) 26 (b) 27 (c) 25 (d) 23
  13. 13.30 × 4 =
  14. 14.1 + 2 + 3 + … + 28 =
  15. 15.A father is 37 years old and his son is 7. How old was the father when the son was born?
  16. 16.I thought of a number, added 2 and then doubled it. I got 38. What was my number?
  17. 17.1 + 3 + 5 + … + 11 =
  18. 18.29 × 4 =
  19. 19.Magic trick! Think of 15. Double it, add 4, halve it, then take away 15. What number do you get?
  20. 20.11111 × 11111 =
  21. 21.I thought of a number, multiplied it by 4 and added 3. I got 51. What was my number?
  22. 22.Magic square (every row, column and diagonal has the same total): 4 11 6 | 9 7 5 | 8 ? 10. What is the missing number?
  23. 23.Magic trick! Think of 4. Double it, add 14, halve it, then take away 4. What number do you get?
  24. 24.13 × 1000 =
  25. 25.I thought of a number, multiplied it by 2 and added 1. I got 31. What was my number?
  26. 26.57 × 4 =
  27. 27.1 + 3 + 5 + … + 49 =
  28. 28.Magic square (every row, column and diagonal has the same total): 15 30 ? | 36 24 12 | 21 18 33. What is the missing number?
  29. 29.436 × ? = 4360
  30. 30.65?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.Double 87 =
  32. 32.27 × 4 =
  33. 33.Magic square (every row, column and diagonal has the same total): 12 22 20 | 26 ? 10 | 16 14 24. What is the missing number?
  34. 34.1 + 2 + 3 + … + 6 =
  35. 35.What comes next? 12, 19, 26, 33, ? (a) 33 (b) 47 (c) 40 (d) 41
  36. 36.Half of 178 =
  37. 37.5 × 9 =
  38. 38.The 1st of a month is a Sunday. What day is the 12th of the same month? (a) Friday (b) Sunday (c) Thursday (d) Wednesday
  39. 39.?928 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 55 and take away the sum of its digits. What do you get?

Answer key

  1. 4
  2. 81
  3. 220
  4. 3321
  5. 3
  6. 8
  7. 987654
  8. 999999999
  9. 8
  10. 36
  11. 8
  12. 25
  13. 120
  14. 406
  15. 30
  16. 17
  17. 36
  18. 116
  19. 2
  20. 123454321
  21. 12
  22. 3
  23. 7
  24. 13000
  25. 15
  26. 228
  27. 625
  28. 27
  29. 10
  30. 2
  31. 174
  32. 108
  33. 18
  34. 21
  35. 40
  36. 89
  37. 45
  38. Thursday
  39. 8
  40. 45

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