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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 262 · 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. 2.9 × 3 =
  3. 3.Magic trick! Think of 12. Double it, add 12, halve it, then take away 12. What number do you get?
  4. 4.I thought of a number, added 3 and then doubled it. I got 16. What was my number?
  5. 5.If today is Thursday, what day will it be after 51 days? (a) Sunday (b) Friday (c) Tuesday (d) Saturday
  6. 6.9 × 6 = 5? — what is the missing digit?
  7. 7.16 × 4 =
  8. 8.9 × 4 =
  9. 9.The ages of two twins add up to 30. How old is each twin?
  10. 10.The 9th of a month is a Monday. What day is the 20th of the same month? (a) Friday (b) Saturday (c) Thursday (d) Monday
  11. 11.12 × 4 =
  12. 12.43 × 4 =
  13. 13.Magic trick! Think of 2. Double it, add 10, halve it, then take away 2. What number do you get?
  14. 14.11 × 11 =
  15. 15.9 × 2 = ?8 — what is the missing digit?
  16. 16.What comes next? 1, 5, 9, 13, ? (a) 17 (b) 18 (c) 13 (d) 21
  17. 17.The 9th of a month is a Saturday. What day is the 30th of the same month? (a) Tuesday (b) Saturday (c) Sunday (d) Friday
  18. 18.380? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.Magic trick! Think of 17. Double it, add 16, halve it, then take away 17. What number do you get?
  20. 20.81?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.Odd one out: which number is NOT in the 8 times table? (a) 25 (b) 16 (c) 40 (d) 32
  22. 22.In 3 years a boy will be 12 years old. How old was he 7 years ago?
  23. 23.Half of 178 =
  24. 24.11 × 4 =
  25. 25.Magic square (every row, column and diagonal has the same total): 11 16 9 | 10 12 14 | ? 8 13. What is the missing number?
  26. 26.Think of 14. Multiply it by 2, then add 1. What number do you end with?
  27. 27.Odd one out: which number is NOT in the 9 times table? (a) 36 (b) 54 (c) 35 (d) 45
  28. 28.37 × 21 =
  29. 29.Double 61 =
  30. 30.45 × 1000 =
  31. 31.If today is Monday, what day was it 47 days ago? (a) Tuesday (b) Wednesday (c) Saturday (d) Thursday
  32. 32.Magic trick! Think of 14. Double it, add 8, halve it, then take away 14. What number do you get?
  33. 33.8 × 9 =
  34. 34.?575 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.27 × 4 =
  36. 36.88 × ? = 8800
  37. 37.9 × 8 = 7? — what is the missing digit?
  38. 38.12345679 × 9 =
  39. 39.37 × 24 =
  40. 40.If today is Wednesday, what day will it be after 95 days? (a) Wednesday (b) Sunday (c) Monday (d) Saturday

Answer key

  1. 9
  2. 27
  3. 6
  4. 5
  5. Saturday
  6. 4
  7. 64
  8. 36
  9. 15
  10. Friday
  11. 48
  12. 172
  13. 5
  14. 121
  15. 1
  16. 17
  17. Saturday
  18. 7
  19. 8
  20. 1
  21. 25
  22. 2
  23. 89
  24. 44
  25. 15
  26. 29
  27. 35
  28. 777
  29. 122
  30. 45000
  31. Wednesday
  32. 4
  33. 72
  34. 1
  35. 108
  36. 100
  37. 2
  38. 111111111
  39. 888
  40. Sunday

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