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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 850 · 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.If today is Sunday, what day was it 14 days ago? (a) Monday (b) Sunday (c) Wednesday (d) Saturday
  2. 2.9 × 3 = 2? — what is the missing digit?
  3. 3.?817 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.A girl is 10 years old and her brother is 2 years older. How old will her brother be in 9 years?
  5. 5.9 × 3 =
  6. 6.50 × ? = 5000
  7. 7.Odd one out: which number is NOT in the 4 times table? (a) 34 (b) 16 (c) 8 (d) 12
  8. 8.158 × 10 =
  9. 9.9 × 4 =
  10. 10.1 + 2 + 3 + … + 25 =
  11. 11.45 × 4 =
  12. 12.9 × 9 =
  13. 13.1 + 2 + 3 + … + 54 =
  14. 14.53 × 4 =
  15. 15.12345678 × 9 + 9 =
  16. 16.71 × 100 =
  17. 17.1234 × 8 + 4 =
  18. 18.6 × 4 =
  19. 19.9 × 1 =
  20. 20.12 × 9 + 3 =
  21. 21.1 + 3 + 5 + … + 39 =
  22. 22.Magic square (every row, column and diagonal has the same total): 12 17 10 | ? 13 15 | 16 9 14. What is the missing number?
  23. 23.60 × 4 =
  24. 24.The 3rd of a month is a Wednesday. What day is the 27th of the same month? (a) Friday (b) Sunday (c) Tuesday (d) Saturday
  25. 25.If today is Friday, what day will it be after 99 days? (a) Saturday (b) Sunday (c) Friday (d) Tuesday
  26. 26.11111 × 11111 =
  27. 27.Take 924. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  28. 28.Take 732. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  29. 29.9 × 4 = 3? — what is the missing digit?
  30. 30.11 × 11 =
  31. 31.9 × 7 = 6? — what is the missing digit?
  32. 32.891 + 198 =
  33. 33.If today is Friday, what day was it 42 days ago? (a) Saturday (b) Thursday (c) Monday (d) Friday
  34. 34.What comes next? 25, 36, 49, 64, ? (a) 83 (b) 82 (c) 81 (d) 79
  35. 35.58 × 4 =
  36. 36.I thought of a number, multiplied it by 2 and added 5. I got 27. What was my number?
  37. 37.6 × 9 =
  38. 38.9 × 9 = ?1 — what is the missing digit?
  39. 39.297 + 792 =
  40. 40.96 × ? = 9600

Answer key

  1. Sunday
  2. 7
  3. 2
  4. 21
  5. 27
  6. 100
  7. 34
  8. 1580
  9. 36
  10. 325
  11. 180
  12. 81
  13. 1485
  14. 212
  15. 111111111
  16. 7100
  17. 9876
  18. 24
  19. 9
  20. 111
  21. 400
  22. 11
  23. 240
  24. Saturday
  25. Saturday
  26. 123454321
  27. 495
  28. 495
  29. 6
  30. 121
  31. 3
  32. 1089
  33. Friday
  34. 81
  35. 232
  36. 11
  37. 54
  38. 8
  39. 1089
  40. 100

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