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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 127 · 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 + 3 + 5 + … + 21 =
  2. 2.9 × 4 = 3? — what is the missing digit?
  3. 3.9 × 9 =
  4. 4.What comes next? 5, 8, 11, 14, ? (a) 14 (b) 17 (c) 20 (d) 18
  5. 5.1 + 2 + 3 + … + 97 =
  6. 6.1 + 2 + 3 + … + 16 =
  7. 7.58 × 4 =
  8. 8.Odd one out: which number is NOT in the 7 times table? (a) 14 (b) 21 (c) 35 (d) 19
  9. 9.Magic square (every row, column and diagonal has the same total): 9 2 7 | ? 6 8 | 5 10 3. What is the missing number?
  10. 10.33 × 4 =
  11. 11.Magic square (every row, column and diagonal has the same total): 18 20 10 | 8 16 ? | 22 12 14. What is the missing number?
  12. 12.1 + 2 + 3 + … + 39 =
  13. 13.Half of 166 =
  14. 14.I thought of a number, multiplied it by 3 and added 3. I got 15. What was my number?
  15. 15.123 × 8 + 3 =
  16. 16.6 × 9 =
  17. 17.You have 13 coins. Each coin is ₹1 or ₹2, and together they make ₹16. How many ₹2 coins do you have?
  18. 18.20 × 4 =
  19. 19.11111 × 11111 =
  20. 20.Magic square (every row, column and diagonal has the same total): 12 ? 10 | 11 13 15 | 16 9 14. What is the missing number?
  21. 21.9 × 5 = ?5 — what is the missing digit?
  22. 22.If today is Monday, what day was it 31 days ago? (a) Saturday (b) Thursday (c) Friday (d) Monday
  23. 23.The 7th of a month is a Wednesday. What day is the 18th of the same month? (a) Monday (b) Sunday (c) Wednesday (d) Saturday
  24. 24.What comes next? 4, 6, 8, 10, ? (a) 13 (b) 12 (c) 10 (d) 14
  25. 25.9 × 2 = 1? — what is the missing digit?
  26. 26.If today is Wednesday, what day was it 56 days ago? (a) Tuesday (b) Saturday (c) Wednesday (d) Thursday
  27. 27.If today is Sunday, what day was it 17 days ago? (a) Thursday (b) Wednesday (c) Friday (d) Sunday
  28. 28.594 + 495 =
  29. 29.123456789 × 8 + 9 =
  30. 30.1 + 3 + 5 + … + 11 =
  31. 31.1 + 2 + 3 + … + 40 =
  32. 32.7?85 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.23 × 4 =
  34. 34.9 × 7 =
  35. 35.9 × 4 = ?6 — what is the missing digit?
  36. 36.15 × 4 =
  37. 37.Magic trick! Think of 9. Double it, add 18, halve it, then take away 9. What number do you get?
  38. 38.?628 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.9 × 2 =
  40. 40.591? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

  1. 121
  2. 6
  3. 81
  4. 17
  5. 4753
  6. 136
  7. 232
  8. 19
  9. 4
  10. 132
  11. 24
  12. 780
  13. 83
  14. 4
  15. 987
  16. 54
  17. 3
  18. 80
  19. 123454321
  20. 17
  21. 4
  22. Friday
  23. Sunday
  24. 12
  25. 8
  26. Wednesday
  27. Thursday
  28. 1089
  29. 987654321
  30. 36
  31. 820
  32. 7
  33. 92
  34. 63
  35. 3
  36. 60
  37. 9
  38. 2
  39. 18
  40. 3

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