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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 365 · 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 × 2 = 1? — what is the missing digit?
  2. 2.9 × 7 =
  3. 3.Think of 12. Multiply it by 5, then add 3. What number do you end with?
  4. 4.What comes next? 1, 4, 9, 16, ? (a) 26 (b) 23 (c) 25 (d) 27
  5. 5.1 + 2 + 3 + … + 88 =
  6. 6.Magic square (every row, column and diagonal has the same total): 29 14 17 | 8 20 32 | ? 26 11. What is the missing number?
  7. 7.10 × 9 =
  8. 8.Odd one out: which number is NOT in the 4 times table? (a) 17 (b) 32 (c) 16 (d) 24
  9. 9.What comes next? 17, 24, 31, 38, ? (a) 46 (b) 45 (c) 52 (d) 38
  10. 10.Magic square (every row, column and diagonal has the same total): 9 8 13 | 14 10 6 | 7 12 ?. What is the missing number?
  11. 11.2?36 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.What comes next? 6, 9, 12, 15, ? (a) 18 (b) 19 (c) 21 (d) 15
  13. 13.Magic square (every row, column and diagonal has the same total): 16 11 12 | ? 13 17 | 14 15 10. What is the missing number?
  14. 14.If today is Thursday, what day was it 58 days ago? (a) Monday (b) Tuesday (c) Wednesday (d) Friday
  15. 15.21?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.If today is Thursday, what day will it be after 81 days? (a) Tuesday (b) Monday (c) Thursday (d) Sunday
  17. 17.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
  18. 18.If today is Sunday, what day was it 48 days ago? (a) Tuesday (b) Sunday (c) Thursday (d) Monday
  19. 19.Odd one out: which number is NOT in the 3 times table? (a) 18 (b) 27 (c) 12 (d) 22
  20. 20.1 + 2 + 3 + … + 38 =
  21. 21.I thought of a number, added 1 and then doubled it. I got 28. What was my number?
  22. 22.1 + 3 + 5 + … + 45 =
  23. 23.If today is Wednesday, what day was it 23 days ago? (a) Thursday (b) Sunday (c) Monday (d) Tuesday
  24. 24.9 × 6 = ?4 — what is the missing digit?
  25. 25.9 × 4 =
  26. 26.1 + 2 + 3 + … + 19 =
  27. 27.Odd one out: which number is NOT in the 5 times table? (a) 40 (b) 11 (c) 20 (d) 35
  28. 28.If today is Thursday, what day will it be after 84 days? (a) Friday (b) Wednesday (c) Sunday (d) Thursday
  29. 29.55 × 100 =
  30. 30.I thought of a number, multiplied it by 2 and added 6. I got 34. What was my number?
  31. 31.If today is Wednesday, what day was it 46 days ago? (a) Tuesday (b) Saturday (c) Sunday (d) Friday
  32. 32.9 × 5 = 4? — what is the missing digit?
  33. 33.If today is Thursday, what day was it 38 days ago? (a) Thursday (b) Sunday (c) Monday (d) Tuesday
  34. 34.Do the 1089 trick with 276: reverse and subtract, then reverse that answer and add. What do you get?
  35. 35.A father is 33 years old and his son is 7. How old was the father when the son was born?
  36. 36.39 × 1000 =
  37. 37.9 × 8 = ?2 — what is the missing digit?
  38. 38.Take 457. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  39. 39.If today is Tuesday, what day will it be after 46 days? (a) Tuesday (b) Saturday (c) Friday (d) Sunday
  40. 40.Double 58 =

Answer key

  1. 8
  2. 63
  3. 63
  4. 25
  5. 3916
  6. 23
  7. 90
  8. 17
  9. 45
  10. 11
  11. 7
  12. 18
  13. 9
  14. Tuesday
  15. 4
  16. Monday
  17. 594
  18. Monday
  19. 22
  20. 741
  21. 13
  22. 529
  23. Monday
  24. 5
  25. 36
  26. 190
  27. 11
  28. Thursday
  29. 5500
  30. 14
  31. Saturday
  32. 5
  33. Monday
  34. 1089
  35. 26
  36. 39000
  37. 7
  38. 297
  39. Saturday
  40. 116

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