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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 547 · 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. 1.9 × 10 = ?0 — what is the missing digit?
  2. 2.Double 83 =
  3. 3.594 + 495 =
  4. 4.If today is Sunday, what day will it be after 30 days? (a) Wednesday (b) Tuesday (c) Monday (d) Friday
  5. 5.9 × 1 =
  6. 6.What comes next? 4, 8, 16, 32, ? (a) 64 (b) 56 (c) 48 (d) 65
  7. 7.10 × 4 =
  8. 8.What comes next? 9, 18, 27, 36, ? (a) 54 (b) 46 (c) 45 (d) 36
  9. 9.1 + 3 + 5 + … + 31 =
  10. 10.1 + 2 + 3 + … + 50 =
  11. 11.In 3 years a boy will be 13 years old. How old was he 2 years ago?
  12. 12.Magic square (every row, column and diagonal has the same total): 6 5 10 | 11 7 3 | 4 9 ?. What is the missing number?
  13. 13.11111 × 11111 =
  14. 14.14 × 4 =
  15. 15.Magic square (every row, column and diagonal has the same total): 20 5 26 | 23 17 11 | 8 ? 14. What is the missing number?
  16. 16.The ages of two twins add up to 30. How old is each twin?
  17. 17.I thought of a number, multiplied it by 2 and added 8. I got 22. What was my number?
  18. 18.If today is Friday, what day will it be after 36 days? (a) Sunday (b) Saturday (c) Tuesday (d) Friday
  19. 19.Magic trick! Think of 12. Double it, add 18, halve it, then take away 12. What number do you get?
  20. 20.111 × 111 =
  21. 21.Double 81 =
  22. 22.1 + 2 + 3 + … + 24 =
  23. 23.9 × 3 = ?7 — what is the missing digit?
  24. 24.20 × 4 =
  25. 25.52 × 4 =
  26. 26.6 × 4 =
  27. 27.29 × 4 =
  28. 28.Do the 1089 trick with 570: reverse and subtract, then reverse that answer and add. What do you get?
  29. 29.Double 84 =
  30. 30.1 × 9 =
  31. 31.37 × 6 =
  32. 32.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  33. 33.?575 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.18 × 100 =
  35. 35.39 × ? = 39000
  36. 36.What comes next? 18, 27, 36, 45, ? (a) 54 (b) 63 (c) 55 (d) 45
  37. 37.46 × 4 =
  38. 38.9 × 5 = 4? — what is the missing digit?
  39. 39.8 × 4 =
  40. 40.9 × 8 =

Answer key

  1. 9
  2. 166
  3. 1089
  4. Tuesday
  5. 9
  6. 64
  7. 40
  8. 45
  9. 256
  10. 1275
  11. 8
  12. 8
  13. 123454321
  14. 56
  15. 29
  16. 15
  17. 7
  18. Saturday
  19. 9
  20. 12321
  21. 162
  22. 300
  23. 2
  24. 80
  25. 208
  26. 24
  27. 116
  28. 1089
  29. 168
  30. 9
  31. 222
  32. 297
  33. 1
  34. 1800
  35. 1000
  36. 54
  37. 184
  38. 5
  39. 32
  40. 72

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