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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 808 · 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. 1.12345678 × 9 + 9 =
  2. 2.?257 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.I thought of a number, multiplied it by 3 and added 2. I got 41. What was my number?
  4. 4.Take 351. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  5. 5.9 × 8 = 7? — what is the missing digit?
  6. 6.9 × 10 =
  7. 7.9 × 10 = 9? — what is the missing digit?
  8. 8.A girl is 8 years old and her brother is 2 years older. How old will her brother be in 6 years?
  9. 9.The 7th of a month is a Friday. What day is the 27th of the same month? (a) Thursday (b) Sunday (c) Friday (d) Wednesday
  10. 10.12 × 8 + 2 =
  11. 11.Double 93 =
  12. 12.In 3 years a boy will be 17 years old. How old was he 6 years ago?
  13. 13.?808 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.7?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.37 × 12 =
  16. 16.What comes next? 16, 25, 36, 49, ? (a) 64 (b) 65 (c) 66 (d) 62
  17. 17.3 × 9 =
  18. 18.Take 98 and take away the sum of its digits. What do you get?
  19. 19.?213 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.Odd one out: which number is NOT in the 6 times table? (a) 30 (b) 18 (c) 34 (d) 24
  21. 21.52 × 4 =
  22. 22.What comes next? 2, 4, 8, 16, ? (a) 32 (b) 33 (c) 24 (d) 28
  23. 23.123 × 9 + 4 =
  24. 24.9 × 6 = ?4 — what is the missing digit?
  25. 25.94 × ? = 940
  26. 26.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  27. 27.I thought of a number, added 1 and then doubled it. I got 40. What was my number?
  28. 28.2 × 9 =
  29. 29.9 × 7 = 6? — what is the missing digit?
  30. 30.What comes next? 18, 24, 30, 36, ? (a) 43 (b) 48 (c) 36 (d) 42
  31. 31.24 × 4 =
  32. 32.If today is Wednesday, what day will it be after 14 days? (a) Tuesday (b) Wednesday (c) Saturday (d) Thursday
  33. 33.9 × 9 = 8? — what is the missing digit?
  34. 34.A father is 30 years old and his son is 8. How old was the father when the son was born?
  35. 35.If today is Sunday, what day will it be after 93 days? (a) Friday (b) Monday (c) Tuesday (d) Wednesday
  36. 36.Think of 5. Multiply it by 2, then add 7. What number do you end with?
  37. 37.9 × 10 = ?0 — what is the missing digit?
  38. 38.1 + 3 + 5 + … + 15 =
  39. 39.9 × 4 = ?6 — what is the missing digit?
  40. 40.34 × 4 =

Answer key

  1. 111111111
  2. 4
  3. 13
  4. 198
  5. 2
  6. 90
  7. 0
  8. 16
  9. Thursday
  10. 98
  11. 186
  12. 8
  13. 2
  14. 9
  15. 444
  16. 64
  17. 27
  18. 81
  19. 3
  20. 34
  21. 208
  22. 32
  23. 1111
  24. 5
  25. 10
  26. 297
  27. 19
  28. 18
  29. 3
  30. 42
  31. 96
  32. Wednesday
  33. 1
  34. 22
  35. Tuesday
  36. 17
  37. 9
  38. 64
  39. 3
  40. 136

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