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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 921 · 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. 1.1 + 2 + 3 + … + 32 =
  2. 2.Odd one out: which number is NOT in the 5 times table? (a) 20 (b) 10 (c) 35 (d) 41
  3. 3.If today is Sunday, what day will it be after 72 days? (a) Wednesday (b) Friday (c) Monday (d) Tuesday
  4. 4.1 + 2 + 3 + … + 91 =
  5. 5.1 + 2 + 3 + … + 60 =
  6. 6.8?75 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.37 × 18 =
  8. 8.1 + 2 + 3 + … + 56 =
  9. 9.57 × 4 =
  10. 10.I thought of a number, multiplied it by 5 and added 1. I got 51. What was my number?
  11. 11.2 × 9 =
  12. 12.2?99 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.9 × 4 = ?6 — what is the missing digit?
  14. 14.If today is Thursday, what day will it be after 88 days? (a) Sunday (b) Tuesday (c) Monday (d) Thursday
  15. 15.Magic square (every row, column and diagonal has the same total): 7 28 13 | 22 16 ? | 19 4 25. What is the missing number?
  16. 16.Magic trick! Think of 12. Double it, add 14, halve it, then take away 12. What number do you get?
  17. 17.198 + 891 =
  18. 18.Half of 158 =
  19. 19.67?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.Double 68 =
  21. 21.9 × 9 = 8? — what is the missing digit?
  22. 22.I thought of a number, added 3 and then doubled it. I got 46. What was my number?
  23. 23.?068 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.?445 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.9 × 9 = ?1 — what is the missing digit?
  26. 26.Half of 162 =
  27. 27.9 × 8 = 7? — what is the missing digit?
  28. 28.317 × 10 =
  29. 29.9 × 2 =
  30. 30.Double 94 =
  31. 31.5 × 9 =
  32. 32.A girl is 11 years old and her brother is 2 years older. How old will her brother be in 3 years?
  33. 33.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
  34. 34.15 × 100 =
  35. 35.If today is Saturday, what day was it 39 days ago? (a) Monday (b) Tuesday (c) Wednesday (d) Friday
  36. 36.Half of 16 =
  37. 37.Magic trick! Think of 18. Double it, add 16, halve it, then take away 18. What number do you get?
  38. 38.93 × ? = 9300
  39. 39.I thought of a number, multiplied it by 3 and added 8. I got 26. What was my number?
  40. 40.12345678 × 9 + 9 =

Answer key

  1. 528
  2. 41
  3. Tuesday
  4. 4186
  5. 1830
  6. 7
  7. 666
  8. 1596
  9. 228
  10. 10
  11. 18
  12. 7
  13. 3
  14. Monday
  15. 10
  16. 7
  17. 1089
  18. 79
  19. 4
  20. 136
  21. 1
  22. 20
  23. 4
  24. 5
  25. 8
  26. 81
  27. 2
  28. 3170
  29. 18
  30. 188
  31. 45
  32. 16
  33. 198
  34. 1500
  35. Tuesday
  36. 8
  37. 8
  38. 100
  39. 6
  40. 111111111

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