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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 237 · 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. 1.5 × 9 =
  2. 2.831? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.You have 8 coins. Each coin is ₹1 or ₹2, and together they make ₹15. How many ₹2 coins do you have?
  4. 4.If today is Sunday, what day was it 45 days ago? (a) Sunday (b) Thursday (c) Wednesday (d) Friday
  5. 5.792 × 10 =
  6. 6.Half of 136 =
  7. 7.Magic trick! Think of 5. Double it, add 4, halve it, then take away 5. What number do you get?
  8. 8.Take 73 and take away the sum of its digits. What do you get?
  9. 9.Odd one out: which number is NOT in the 9 times table? (a) 54 (b) 45 (c) 36 (d) 49
  10. 10.I thought of a number, multiplied it by 5 and added 2. I got 72. What was my number?
  11. 11.What comes next? 5, 9, 13, 17, ? (a) 17 (b) 22 (c) 21 (d) 25
  12. 12.A father is 44 years old and his son is 5. How old was the father when the son was born?
  13. 13.Double 61 =
  14. 14.25?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.9 × 7 = ?3 — what is the missing digit?
  16. 16.If today is Monday, what day will it be after 37 days? (a) Tuesday (b) Thursday (c) Saturday (d) Wednesday
  17. 17.1 + 3 + 5 + … + 19 =
  18. 18.Double 99 =
  19. 19.12345679 × 9 =
  20. 20.8?63 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.Magic trick! Think of 6. Double it, add 6, halve it, then take away 6. What number do you get?
  22. 22.Magic square (every row, column and diagonal has the same total): ? 7 17 | 19 11 3 | 5 15 13. What is the missing number?
  23. 23.18 × ? = 1800
  24. 24.11 × 11 =
  25. 25.If today is Saturday, what day was it 47 days ago? (a) Tuesday (b) Sunday (c) Monday (d) Thursday
  26. 26.49 × 1000 =
  27. 27.What comes next? 9, 16, 25, 36, ? (a) 47 (b) 50 (c) 49 (d) 51
  28. 28.The 2nd of a month is a Saturday. What day is the 27th of the same month? (a) Saturday (b) Tuesday (c) Thursday (d) Wednesday
  29. 29.9 × 9 =
  30. 30.You have 8 coins. Each coin is ₹1 or ₹2, and together they make ₹14. How many ₹2 coins do you have?
  31. 31.Think of 7. Multiply it by 5, then add 5. What number do you end with?
  32. 32.Think of 10. Multiply it by 4, then add 6. What number do you end with?
  33. 33.5?60 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.20 × 1000 =
  35. 35.20 × 4 =
  36. 36.9 × 4 =
  37. 37.35 × 4 =
  38. 38.54 × 4 =
  39. 39.2 × 9 =
  40. 40.You have 6 coins. Each coin is ₹1 or ₹2, and together they make ₹11. How many ₹2 coins do you have?

Answer key

  1. 45
  2. 6
  3. 7
  4. Thursday
  5. 7920
  6. 68
  7. 2
  8. 63
  9. 49
  10. 14
  11. 21
  12. 39
  13. 122
  14. 9
  15. 6
  16. Wednesday
  17. 100
  18. 198
  19. 111111111
  20. 1
  21. 3
  22. 9
  23. 100
  24. 121
  25. Monday
  26. 49000
  27. 49
  28. Wednesday
  29. 81
  30. 6
  31. 40
  32. 46
  33. 7
  34. 20000
  35. 80
  36. 36
  37. 140
  38. 216
  39. 18
  40. 5

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