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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 246 · 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.Double 94 =
  2. 2.123456789 × 8 + 9 =
  3. 3.111111 × 111111 =
  4. 4.What comes next? 1, 4, 9, 16, ? (a) 25 (b) 26 (c) 23 (d) 27
  5. 5.9 × 9 = 8? — what is the missing digit?
  6. 6.I thought of a number, added 5 and then doubled it. I got 46. What was my number?
  7. 7.22 × 4 =
  8. 8.17 × 4 =
  9. 9.9 × 7 = 6? — what is the missing digit?
  10. 10.Odd one out: which number is NOT in the 5 times table? (a) 15 (b) 20 (c) 30 (d) 34
  11. 11.9 × 4 = 3? — what is the missing digit?
  12. 12.I thought of a number, added 1 and then doubled it. I got 20. What was my number?
  13. 13.10 × 4 =
  14. 14.42 × 4 =
  15. 15.Double 11 =
  16. 16.Magic trick! Think of 5. Double it, add 6, halve it, then take away 5. What number do you get?
  17. 17.396 + 693 =
  18. 18.If today is Tuesday, what day was it 52 days ago? (a) Saturday (b) Tuesday (c) Friday (d) Sunday
  19. 19.I thought of a number, added 7 and then doubled it. I got 50. What was my number?
  20. 20.611 × 10 =
  21. 21.What comes next? 4, 8, 16, 32, ? (a) 65 (b) 56 (c) 64 (d) 48
  22. 22.If today is Saturday, what day was it 41 days ago? (a) Wednesday (b) Sunday (c) Saturday (d) Monday
  23. 23.48 × ? = 4800
  24. 24.1 + 2 + 3 + … + 77 =
  25. 25.9 × 6 = ?4 — what is the missing digit?
  26. 26.Odd one out: which number is NOT in the 7 times table? (a) 59 (b) 28 (c) 49 (d) 42
  27. 27.I thought of a number, added 9 and then doubled it. I got 34. What was my number?
  28. 28.I thought of a number, multiplied it by 2 and added 3. I got 11. What was my number?
  29. 29.What comes next? 2, 4, 8, 16, ? (a) 24 (b) 32 (c) 33 (d) 28
  30. 30.492 × ? = 4920
  31. 31.9 × 9 =
  32. 32.Do the 1089 trick with 984: reverse and subtract, then reverse that answer and add. What do you get?
  33. 33.If today is Friday, what day will it be after 46 days? (a) Tuesday (b) Monday (c) Friday (d) Wednesday
  34. 34.2 × 9 =
  35. 35.Double 81 =
  36. 36.Magic square (every row, column and diagonal has the same total): 17 14 29 | ? 20 8 | 11 26 23. What is the missing number?
  37. 37.50 × ? = 50000
  38. 38.24 × 1000 =
  39. 39.7 × 4 =
  40. 40.If today is Monday, what day will it be after 97 days? (a) Wednesday (b) Saturday (c) Sunday (d) Monday

Answer key

  1. 188
  2. 987654321
  3. 12345654321
  4. 25
  5. 1
  6. 18
  7. 88
  8. 68
  9. 3
  10. 34
  11. 6
  12. 9
  13. 40
  14. 168
  15. 22
  16. 3
  17. 1089
  18. Saturday
  19. 18
  20. 6110
  21. 64
  22. Sunday
  23. 100
  24. 3003
  25. 5
  26. 59
  27. 8
  28. 4
  29. 32
  30. 10
  31. 81
  32. 1089
  33. Tuesday
  34. 18
  35. 162
  36. 32
  37. 1000
  38. 24000
  39. 28
  40. Sunday

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