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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 946 · 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. 1.54 × ? = 5400
  2. 2.Think of 5. Multiply it by 5, then add 3. What number do you end with?
  3. 3.9 × 6 = 5? — what is the missing digit?
  4. 4.28 × ? = 28000
  5. 5.Double 27 =
  6. 6.Think of 2. Multiply it by 2, then add 9. What number do you end with?
  7. 7.I thought of a number, multiplied it by 3 and added 6. I got 12. What was my number?
  8. 8.9 × 4 = ?6 — what is the missing digit?
  9. 9.1 + 2 + 3 + … + 82 =
  10. 10.What comes next? 16, 24, 32, 40, ? (a) 56 (b) 40 (c) 49 (d) 48
  11. 11.What comes next? 16, 19, 22, 25, ? (a) 31 (b) 28 (c) 29 (d) 25
  12. 12.12345678 × 9 + 9 =
  13. 13.Double 89 =
  14. 14.11111 × 11111 =
  15. 15.9 × 10 =
  16. 16.Take 31 and take away the sum of its digits. What do you get?
  17. 17.123456789 × 8 + 9 =
  18. 18.What comes next? 5, 10, 20, 40, ? (a) 60 (b) 70 (c) 81 (d) 80
  19. 19.1 + 2 + 3 + … + 64 =
  20. 20.41 × 4 =
  21. 21.Double 83 =
  22. 22.7 × 9 =
  23. 23.In 4 years a boy will be 16 years old. How old was he 7 years ago?
  24. 24.Odd one out: which number is NOT in the 5 times table? (a) 35 (b) 20 (c) 15 (d) 11
  25. 25.If today is Monday, what day was it 44 days ago? (a) Sunday (b) Saturday (c) Tuesday (d) Friday
  26. 26.Double 17 =
  27. 27.The 6th of a month is a Saturday. What day is the 18th of the same month? (a) Wednesday (b) Sunday (c) Friday (d) Thursday
  28. 28.9 × 9 =
  29. 29.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
  30. 30.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  31. 31.Double 34 =
  32. 32.I thought of a number, multiplied it by 3 and added 9. I got 15. What was my number?
  33. 33.9 × 8 = ?2 — what is the missing digit?
  34. 34.9 × 7 = ?3 — what is the missing digit?
  35. 35.What comes next? 25, 36, 49, 64, ? (a) 79 (b) 83 (c) 81 (d) 82
  36. 36.1 + 3 + 5 + … + 9 =
  37. 37.1?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.476? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.37 × 4 =
  40. 40.12345679 × 18 =

Answer key

  1. 100
  2. 28
  3. 4
  4. 1000
  5. 54
  6. 13
  7. 2
  8. 3
  9. 3403
  10. 48
  11. 28
  12. 111111111
  13. 178
  14. 123454321
  15. 90
  16. 27
  17. 987654321
  18. 80
  19. 2080
  20. 164
  21. 166
  22. 63
  23. 5
  24. 11
  25. Saturday
  26. 34
  27. Thursday
  28. 81
  29. 396
  30. 693
  31. 68
  32. 2
  33. 7
  34. 6
  35. 81
  36. 25
  37. 8
  38. 1
  39. 148
  40. 222222222

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