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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 714 · 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 + … + 78 =
  2. 2.2?05 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.1?59 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.The 1st of a month is a Friday. What day is the 14th of the same month? (a) Wednesday (b) Thursday (c) Sunday (d) Friday
  5. 5.28 × 4 =
  6. 6.12345679 × 9 =
  7. 7.What comes next? 4, 8, 16, 32, ? (a) 48 (b) 56 (c) 64 (d) 65
  8. 8.1 + 2 + 3 + … + 89 =
  9. 9.123 × 9 + 4 =
  10. 10.37 × 4 =
  11. 11.Take 890. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  12. 12.52 × 4 =
  13. 13.Magic square (every row, column and diagonal has the same total): 29 ? 17 | 8 20 32 | 23 26 11. What is the missing number?
  14. 14.Take 11 and take away the sum of its digits. What do you get?
  15. 15.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
  16. 16.1 + 2 + 3 + … + 13 =
  17. 17.Double 19 =
  18. 18.What comes next? 25, 36, 49, 64, ? (a) 83 (b) 82 (c) 79 (d) 81
  19. 19.1 + 2 + 3 + … + 73 =
  20. 20.9 × 1 =
  21. 21.Magic square (every row, column and diagonal has the same total): ? 5 26 | 23 17 11 | 8 29 14. What is the missing number?
  22. 22.If today is Wednesday, what day will it be after 53 days? (a) Monday (b) Wednesday (c) Sunday (d) Saturday
  23. 23.6?19 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.A girl is 5 years old and her brother is 6 years older. How old will her brother be in 9 years?
  25. 25.9 × 8 =
  26. 26.A father is 41 years old and his son is 11. How old was the father when the son was born?
  27. 27.1111 × 1111 =
  28. 28.A girl is 8 years old and her brother is 2 years older. How old will her brother be in 3 years?
  29. 29.123456 × 9 + 7 =
  30. 30.3 × 9 =
  31. 31.198 + 891 =
  32. 32.9 × 7 = ?3 — what is the missing digit?
  33. 33.15 × 4 =
  34. 34.If today is Monday, what day will it be after 79 days? (a) Saturday (b) Thursday (c) Tuesday (d) Wednesday
  35. 35.27 × ? = 27000
  36. 36.Odd one out: which number is NOT in the 7 times table? (a) 35 (b) 19 (c) 21 (d) 56
  37. 37.Do the 1089 trick with 900: reverse and subtract, then reverse that answer and add. What do you get?
  38. 38.Magic square (every row, column and diagonal has the same total): 31 ? 19 | 10 22 34 | 25 28 13. What is the missing number?
  39. 39.If today is Wednesday, what day was it 51 days ago? (a) Tuesday (b) Monday (c) Sunday (d) Thursday
  40. 40.A girl is 6 years old and her brother is 6 years older. How old will her brother be in 8 years?

Answer key

  1. 3081
  2. 2
  3. 3
  4. Thursday
  5. 112
  6. 111111111
  7. 64
  8. 4005
  9. 1111
  10. 148
  11. 792
  12. 208
  13. 14
  14. 9
  15. 594
  16. 91
  17. 38
  18. 81
  19. 2701
  20. 9
  21. 20
  22. Sunday
  23. 2
  24. 20
  25. 72
  26. 30
  27. 1234321
  28. 13
  29. 1111111
  30. 27
  31. 1089
  32. 6
  33. 60
  34. Wednesday
  35. 1000
  36. 19
  37. 1089
  38. 16
  39. Monday
  40. 20

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