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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 822 · 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. 1.455 × ? = 4550
  2. 2.9 × ? = 900
  3. 3.A father is 35 years old and his son is 4. How old was the father when the son was born?
  4. 4.Magic trick! Think of 9. Double it, add 18, halve it, then take away 9. What number do you get?
  5. 5.20 × 4 =
  6. 6.4?50 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.6 × ? = 6000
  8. 8.9 × 4 = ?6 — what is the missing digit?
  9. 9.369 × 10 =
  10. 10.3 × 9 =
  11. 11.49 × 1000 =
  12. 12.50 × 4 =
  13. 13.29 × 4 =
  14. 14.8?35 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 54 and take away the sum of its digits. What do you get?
  16. 16.Magic square (every row, column and diagonal has the same total): 26 29 14 | 11 23 ? | 32 17 20. What is the missing number?
  17. 17.5 × 9 =
  18. 18.Double 42 =
  19. 19.Magic square (every row, column and diagonal has the same total): 20 35 14 | 17 23 29 | ? 11 26. What is the missing number?
  20. 20.What comes next? 25, 36, 49, 64, ? (a) 82 (b) 81 (c) 83 (d) 79
  21. 21.If today is Sunday, what day was it 50 days ago? (a) Saturday (b) Tuesday (c) Friday (d) Sunday
  22. 22.1 + 3 + 5 + … + 37 =
  23. 23.117 × 10 =
  24. 24.1 + 2 + 3 + … + 90 =
  25. 25.10 × 9 =
  26. 26.11111 × 11111 =
  27. 27.Odd one out: which number is NOT in the 3 times table? (a) 12 (b) 13 (c) 9 (d) 21
  28. 28.I thought of a number, multiplied it by 2 and added 1. I got 5. What was my number?
  29. 29.16 × 1000 =
  30. 30.The ages of two twins add up to 14. How old is each twin?
  31. 31.The 2nd of a month is a Tuesday. What day is the 19th of the same month? (a) Saturday (b) Friday (c) Thursday (d) Monday
  32. 32.In 6 years a boy will be 15 years old. How old was he 4 years ago?
  33. 33.9 × 6 = ?4 — what is the missing digit?
  34. 34.If today is Saturday, what day will it be after 36 days? (a) Wednesday (b) Sunday (c) Saturday (d) Monday
  35. 35.Double 36 =
  36. 36.12345679 × 72 =
  37. 37.9 × 7 = ?3 — what is the missing digit?
  38. 38.Magic trick! Think of 17. Double it, add 10, halve it, then take away 17. What number do you get?
  39. 39.Do the 1089 trick with 238: reverse and subtract, then reverse that answer and add. What do you get?
  40. 40.Double 51 =

Answer key

  1. 10
  2. 100
  3. 31
  4. 9
  5. 80
  6. 9
  7. 1000
  8. 3
  9. 3690
  10. 27
  11. 49000
  12. 200
  13. 116
  14. 2
  15. 45
  16. 35
  17. 45
  18. 84
  19. 32
  20. 81
  21. Saturday
  22. 361
  23. 1170
  24. 4095
  25. 90
  26. 123454321
  27. 13
  28. 2
  29. 16000
  30. 7
  31. Friday
  32. 5
  33. 5
  34. Sunday
  35. 72
  36. 888888888
  37. 6
  38. 5
  39. 1089
  40. 102

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