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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 336 · 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.What comes next? 19, 21, 23, 25, ? (a) 28 (b) 29 (c) 27 (d) 25
  2. 2.Take 41 and take away the sum of its digits. What do you get?
  3. 3.26 × 4 =
  4. 4.3 × 9 =
  5. 5.59 × 4 =
  6. 6.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
  7. 7.37 × 9 =
  8. 8.78?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Half of 58 =
  10. 10.9 × 5 = 4? — what is the missing digit?
  11. 11.Magic square (every row, column and diagonal has the same total): 11 ? 17 | 26 20 14 | 23 8 29. What is the missing number?
  12. 12.Magic square (every row, column and diagonal has the same total): ? 22 19 | 28 16 4 | 13 10 25. What is the missing number?
  13. 13.1 + 2 + 3 + … + 98 =
  14. 14.Take 960. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  15. 15.Magic square (every row, column and diagonal has the same total): 14 9 16 | 15 13 11 | 10 17 ?. What is the missing number?
  16. 16.Take 118. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  17. 17.15 × 4 =
  18. 18.1 + 2 + 3 + … + 89 =
  19. 19.Half of 162 =
  20. 20.What comes next? 5, 10, 20, 40, ? (a) 81 (b) 60 (c) 70 (d) 80
  21. 21.Magic trick! Think of 16. Double it, add 18, halve it, then take away 16. What number do you get?
  22. 22.If today is Wednesday, what day will it be after 33 days? (a) Thursday (b) Sunday (c) Tuesday (d) Monday
  23. 23.9 × 9 = ?1 — what is the missing digit?
  24. 24.Double 17 =
  25. 25.9 × 3 =
  26. 26.1 + 3 + 5 + … + 29 =
  27. 27.Double 59 =
  28. 28.Do the 1089 trick with 993: reverse and subtract, then reverse that answer and add. What do you get?
  29. 29.?114 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.13 × 1000 =
  31. 31.9 × 1 =
  32. 32.43 × 4 =
  33. 33.9 × 6 = ?4 — what is the missing digit?
  34. 34.970 × ? = 9700
  35. 35.12345679 × 9 =
  36. 36.If today is Friday, what day will it be after 55 days? (a) Wednesday (b) Friday (c) Thursday (d) Sunday
  37. 37.9 × 8 =
  38. 38.If today is Tuesday, what day will it be after 38 days? (a) Saturday (b) Thursday (c) Monday (d) Friday
  39. 39.562 × ? = 5620
  40. 40.585 × 10 =

Answer key

  1. 27
  2. 36
  3. 104
  4. 27
  5. 236
  6. 891
  7. 333
  8. 9
  9. 29
  10. 5
  11. 32
  12. 7
  13. 4851
  14. 891
  15. 12
  16. 693
  17. 60
  18. 4005
  19. 81
  20. 80
  21. 9
  22. Monday
  23. 8
  24. 34
  25. 27
  26. 225
  27. 118
  28. 1089
  29. 3
  30. 13000
  31. 9
  32. 172
  33. 5
  34. 10
  35. 111111111
  36. Thursday
  37. 72
  38. Friday
  39. 10
  40. 5850

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