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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 46 · 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. 1.1 + 2 + 3 + … + 83 =
  2. 2.48 × 4 =
  3. 3.176 × ? = 1760
  4. 4.29 × 1000 =
  5. 5.792 + 297 =
  6. 6.14 × 4 =
  7. 7.123? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.A girl is 11 years old and her brother is 2 years older. How old will her brother be in 4 years?
  9. 9.9 × 10 = 9? — what is the missing digit?
  10. 10.21 × 4 =
  11. 11.111 × 111 =
  12. 12.Magic trick! Think of 17. Double it, add 10, halve it, then take away 17. What number do you get?
  13. 13.415 × 10 =
  14. 14.10 × 100 =
  15. 15.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
  16. 16.7 × 9 =
  17. 17.17 × 4 =
  18. 18.9 × 3 =
  19. 19.33?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.Magic square (every row, column and diagonal has the same total): 6 20 10 | 16 12 8 | 14 4 ?. What is the missing number?
  21. 21.297 + 792 =
  22. 22.9 × 4 =
  23. 23.9 × 3 = ?7 — what is the missing digit?
  24. 24.The 8th of a month is a Tuesday. What day is the 19th of the same month? (a) Sunday (b) Tuesday (c) Friday (d) Saturday
  25. 25.1 + 3 + 5 + … + 21 =
  26. 26.49 × 1000 =
  27. 27.9 × 10 =
  28. 28.9 × 8 =
  29. 29.9 × 9 =
  30. 30.Double 93 =
  31. 31.What comes next? 16, 25, 36, 49, ? (a) 65 (b) 66 (c) 62 (d) 64
  32. 32.37 × 15 =
  33. 33.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  34. 34.1234 × 8 + 4 =
  35. 35.8 × 9 =
  36. 36.4 × 9 =
  37. 37.11 × 100 =
  38. 38.Magic square (every row, column and diagonal has the same total): ? 12 5 | 6 8 10 | 11 4 9. What is the missing number?
  39. 39.207? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.6?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

  1. 3486
  2. 192
  3. 10
  4. 29000
  5. 1089
  6. 56
  7. 3
  8. 17
  9. 0
  10. 84
  11. 12321
  12. 5
  13. 4150
  14. 1000
  15. 594
  16. 63
  17. 68
  18. 27
  19. 3
  20. 18
  21. 1089
  22. 36
  23. 2
  24. Saturday
  25. 121
  26. 49000
  27. 90
  28. 72
  29. 81
  30. 186
  31. 64
  32. 555
  33. 693
  34. 9876
  35. 72
  36. 36
  37. 1100
  38. 7
  39. 9
  40. 5

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