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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 6 · 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.If today is Thursday, what day will it be after 29 days? (a) Friday (b) Monday (c) Thursday (d) Saturday
  2. 2.What comes next? 6, 14, 22, 30, ? (a) 39 (b) 30 (c) 38 (d) 46
  3. 3.9 × 5 = ?5 — what is the missing digit?
  4. 4.9 × 8 = 7? — what is the missing digit?
  5. 5.74 × 100 =
  6. 6.178 × 10 =
  7. 7.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
  8. 8.The ages of two twins add up to 12. How old is each twin?
  9. 9.9 × 9 =
  10. 10.Magic square (every row, column and diagonal has the same total): ? 9 14 | 15 11 7 | 8 13 12. What is the missing number?
  11. 11.61 × ? = 6100
  12. 12.32 × 1000 =
  13. 13.12345678 × 9 + 9 =
  14. 14.What comes next? 1, 2, 4, 8, ? (a) 16 (b) 14 (c) 17 (d) 12
  15. 15.1 + 2 + 3 + … + 60 =
  16. 16.9 × 6 = 5? — what is the missing digit?
  17. 17.33 × 4 =
  18. 18.Half of 114 =
  19. 19.51 × 4 =
  20. 20.297 + 792 =
  21. 21.Magic square (every row, column and diagonal has the same total): 11 ? 7 | 9 13 17 | 19 5 15. What is the missing number?
  22. 22.12 × 8 + 2 =
  23. 23.1 + 3 + 5 + … + 15 =
  24. 24.Magic square (every row, column and diagonal has the same total): 22 7 28 | 25 19 ? | 10 31 16. What is the missing number?
  25. 25.The ages of two twins add up to 22. How old is each twin?
  26. 26.1 + 2 + 3 + … + 15 =
  27. 27.What comes next? 5, 10, 20, 40, ? (a) 60 (b) 81 (c) 70 (d) 80
  28. 28.12345679 × 54 =
  29. 29.2 × 9 =
  30. 30.14 × 4 =
  31. 31.12 × 9 + 3 =
  32. 32.Magic square (every row, column and diagonal has the same total): ? 16 9 | 10 12 14 | 15 8 13. What is the missing number?
  33. 33.491? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.70 × 100 =
  35. 35.Magic trick! Think of 13. Double it, add 6, halve it, then take away 13. What number do you get?
  36. 36.If today is Friday, what day will it be after 83 days? (a) Friday (b) Wednesday (c) Sunday (d) Thursday
  37. 37.Magic square (every row, column and diagonal has the same total): 24 14 16 | ? 18 26 | 20 22 12. What is the missing number?
  38. 38.A girl is 6 years old and her brother is 2 years older. How old will her brother be in 9 years?
  39. 39.6 × 9 =
  40. 40.Take 84 and take away the sum of its digits. What do you get?

Answer key

  1. Friday
  2. 38
  3. 4
  4. 2
  5. 7400
  6. 1780
  7. 396
  8. 6
  9. 81
  10. 10
  11. 100
  12. 32000
  13. 111111111
  14. 16
  15. 1830
  16. 4
  17. 132
  18. 57
  19. 204
  20. 1089
  21. 21
  22. 98
  23. 64
  24. 13
  25. 11
  26. 120
  27. 80
  28. 666666666
  29. 18
  30. 56
  31. 111
  32. 11
  33. 4
  34. 7000
  35. 3
  36. Thursday
  37. 10
  38. 17
  39. 54
  40. 72

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