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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 798 · 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 × 3 = 2? — what is the missing digit?
  2. 2.Odd one out: which number is NOT in the 9 times table? (a) 27 (b) 36 (c) 29 (d) 45
  3. 3.Think of 12. Multiply it by 2, then add 8. What number do you end with?
  4. 4.Take 340. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  5. 5.Take 164. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  6. 6.1 + 3 + 5 + … + 25 =
  7. 7.Half of 162 =
  8. 8.7 × 9 =
  9. 9.I thought of a number, added 5 and then doubled it. I got 42. What was my number?
  10. 10.7 × 4 =
  11. 11.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
  12. 12.If today is Wednesday, what day was it 21 days ago? (a) Saturday (b) Tuesday (c) Thursday (d) Wednesday
  13. 13.31 × 100 =
  14. 14.Half of 16 =
  15. 15.Half of 154 =
  16. 16.17 × 4 =
  17. 17.Half of 78 =
  18. 18.Take 360. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  19. 19.What comes next? 16, 25, 36, 49, ? (a) 64 (b) 66 (c) 62 (d) 65
  20. 20.12345679 × 72 =
  21. 21.11111 × 11111 =
  22. 22.1 + 2 + 3 + … + 48 =
  23. 23.12 × 4 =
  24. 24.If today is Thursday, what day will it be after 67 days? (a) Thursday (b) Tuesday (c) Monday (d) Sunday
  25. 25.12 × 9 + 3 =
  26. 26.6 × 9 =
  27. 27.47 × 4 =
  28. 28.The 1st of a month is a Sunday. What day is the 18th of the same month? (a) Thursday (b) Saturday (c) Wednesday (d) Tuesday
  29. 29.70?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.243? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.9 × 9 = ?1 — what is the missing digit?
  32. 32.8 × 4 =
  33. 33.Double 57 =
  34. 34.Take 93 and take away the sum of its digits. What do you get?
  35. 35.69 × 100 =
  36. 36.1234 × 8 + 4 =
  37. 37.991 × 10 =
  38. 38.9 × 2 = 1? — what is the missing digit?
  39. 39.8 × 9 =
  40. 40.Think of 11. Multiply it by 3, then add 6. What number do you end with?

Answer key

  1. 7
  2. 29
  3. 32
  4. 297
  5. 297
  6. 169
  7. 81
  8. 63
  9. 16
  10. 28
  11. 594
  12. Wednesday
  13. 3100
  14. 8
  15. 77
  16. 68
  17. 39
  18. 297
  19. 64
  20. 888888888
  21. 123454321
  22. 1176
  23. 48
  24. Monday
  25. 111
  26. 54
  27. 188
  28. Wednesday
  29. 5
  30. 9
  31. 8
  32. 32
  33. 114
  34. 81
  35. 6900
  36. 9876
  37. 9910
  38. 8
  39. 72
  40. 39

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