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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 395 · 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.Think of 2. Multiply it by 2, then add 1. What number do you end with?
  2. 2.8 × 9 =
  3. 3.10 × 9 =
  4. 4.What comes next? 5, 10, 20, 40, ? (a) 60 (b) 70 (c) 81 (d) 80
  5. 5.Magic trick! Think of 10. Double it, add 8, halve it, then take away 10. What number do you get?
  6. 6.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  7. 7.75?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.987 × ? = 9870
  9. 9.1 + 2 + 3 + … + 28 =
  10. 10.2?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.3 × 9 =
  12. 12.The ages of two twins add up to 8. How old is each twin?
  13. 13.12 × 8 + 2 =
  14. 14.If today is Friday, what day will it be after 26 days? (a) Tuesday (b) Saturday (c) Wednesday (d) Thursday
  15. 15.1 + 2 + 3 + … + 99 =
  16. 16.Magic square (every row, column and diagonal has the same total): 5 10 ? | 12 8 4 | 7 6 11. What is the missing number?
  17. 17.I thought of a number, multiplied it by 2 and added 9. I got 17. What was my number?
  18. 18.1 + 2 + 3 + … + 47 =
  19. 19.792 + 297 =
  20. 20.9 × 3 =
  21. 21.Magic square (every row, column and diagonal has the same total): ? 18 8 | 14 10 6 | 12 2 16. What is the missing number?
  22. 22.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
  23. 23.364? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.1 + 2 + 3 + … + 46 =
  25. 25.1 + 2 + 3 + … + 18 =
  26. 26.9 × 8 = ?2 — what is the missing digit?
  27. 27.37 × 27 =
  28. 28.21 × ? = 21000
  29. 29.What comes next? 18, 21, 24, 27, ? (a) 33 (b) 30 (c) 31 (d) 27
  30. 30.Magic square (every row, column and diagonal has the same total): 12 22 8 | 10 ? 18 | 20 6 16. What is the missing number?
  31. 31.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
  32. 32.19 × 1000 =
  33. 33.?769 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.Double 64 =
  35. 35.9 × 3 = ?7 — what is the missing digit?
  36. 36.27 × 4 =
  37. 37.9 × 7 = ?3 — what is the missing digit?
  38. 38.37 × 21 =
  39. 39.12345678 × 9 + 9 =
  40. 40.What comes next? 1, 2, 4, 8, ? (a) 12 (b) 16 (c) 17 (d) 14

Answer key

  1. 5
  2. 72
  3. 90
  4. 80
  5. 4
  6. 693
  7. 9
  8. 10
  9. 406
  10. 5
  11. 27
  12. 4
  13. 98
  14. Wednesday
  15. 4950
  16. 9
  17. 4
  18. 1128
  19. 1089
  20. 27
  21. 4
  22. 396
  23. 5
  24. 1081
  25. 171
  26. 7
  27. 999
  28. 1000
  29. 30
  30. 14
  31. 891
  32. 19000
  33. 5
  34. 128
  35. 2
  36. 108
  37. 6
  38. 777
  39. 111111111
  40. 16

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