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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 485 · 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? 5, 10, 20, 40, ? (a) 80 (b) 70 (c) 81 (d) 60
  2. 2.44 × 100 =
  3. 3.9 × 9 = ?1 — what is the missing digit?
  4. 4.5 × 9 =
  5. 5.123456789 × 8 + 9 =
  6. 6.9 × 8 = ?2 — what is the missing digit?
  7. 7.1 + 2 + 3 + … + 46 =
  8. 8.What comes next? 1, 2, 4, 8, ? (a) 17 (b) 14 (c) 16 (d) 12
  9. 9.Take 19 and take away the sum of its digits. What do you get?
  10. 10.792 + 297 =
  11. 11.What comes next? 9, 16, 25, 36, ? (a) 51 (b) 50 (c) 47 (d) 49
  12. 12.If today is Saturday, what day will it be after 28 days? (a) Friday (b) Tuesday (c) Saturday (d) Sunday
  13. 13.If today is Thursday, what day will it be after 83 days? (a) Tuesday (b) Thursday (c) Wednesday (d) Saturday
  14. 14.30 × 100 =
  15. 15.6 × 9 =
  16. 16.Think of 11. Multiply it by 3, then add 1. What number do you end with?
  17. 17.Think of 10. Multiply it by 2, then add 2. What number do you end with?
  18. 18.9 × 5 = 4? — what is the missing digit?
  19. 19.1 + 3 + 5 + … + 17 =
  20. 20.59 × 4 =
  21. 21.I thought of a number, multiplied it by 2 and added 8. I got 12. What was my number?
  22. 22.Magic trick! Think of 2. Double it, add 18, halve it, then take away 2. What number do you get?
  23. 23.136 × 10 =
  24. 24.20 × 100 =
  25. 25.1 + 2 + 3 + … + 63 =
  26. 26.9 × 6 = ?4 — what is the missing digit?
  27. 27.9 × 2 = 1? — what is the missing digit?
  28. 28.Double 62 =
  29. 29.57 × 4 =
  30. 30.1 + 2 + 3 + … + 67 =
  31. 31.9 × 7 = ?3 — what is the missing digit?
  32. 32.32 × ? = 32000
  33. 33.Double 25 =
  34. 34.Half of 72 =
  35. 35.66 × ? = 6600
  36. 36.Magic square (every row, column and diagonal has the same total): 5 4 9 | 10 6 ? | 3 8 7. What is the missing number?
  37. 37.The 4th of a month is a Monday. What day is the 18th of the same month? (a) Sunday (b) Tuesday (c) Monday (d) Thursday
  38. 38.27 × ? = 27000
  39. 39.Do the 1089 trick with 200: reverse and subtract, then reverse that answer and add. What do you get?
  40. 40.Odd one out: which number is NOT in the 8 times table? (a) 40 (b) 16 (c) 19 (d) 24

Answer key

  1. 80
  2. 4400
  3. 8
  4. 45
  5. 987654321
  6. 7
  7. 1081
  8. 16
  9. 9
  10. 1089
  11. 49
  12. Saturday
  13. Wednesday
  14. 3000
  15. 54
  16. 34
  17. 22
  18. 5
  19. 81
  20. 236
  21. 2
  22. 9
  23. 1360
  24. 2000
  25. 2016
  26. 5
  27. 8
  28. 124
  29. 228
  30. 2278
  31. 6
  32. 1000
  33. 50
  34. 36
  35. 100
  36. 2
  37. Monday
  38. 1000
  39. 1089
  40. 19

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