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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 83 · 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.I thought of a number, multiplied it by 2 and added 7. I got 37. What was my number?
  2. 2.4 × 1000 =
  3. 3.5 × 9 =
  4. 4.Think of 12. Multiply it by 5, then add 2. What number do you end with?
  5. 5.The 1st of a month is a Tuesday. What day is the 24th of the same month? (a) Sunday (b) Wednesday (c) Friday (d) Thursday
  6. 6.3 × 9 =
  7. 7.If today is Thursday, what day will it be after 16 days? (a) Tuesday (b) Friday (c) Sunday (d) Saturday
  8. 8.22 × 4 =
  9. 9.A piggy bank has 11 coins of ₹5 and 14 coins of ₹2. How many rupees are in it?
  10. 10.Magic trick! Think of 3. Double it, add 8, halve it, then take away 3. What number do you get?
  11. 11.Do the 1089 trick with 137: reverse and subtract, then reverse that answer and add. What do you get?
  12. 12.9 × 9 = ?1 — what is the missing digit?
  13. 13.10 × 4 =
  14. 14.I thought of a number, added 4 and then doubled it. I got 24. What was my number?
  15. 15.What comes next? 20, 26, 32, 38, ? (a) 38 (b) 50 (c) 45 (d) 44
  16. 16.Double 59 =
  17. 17.Odd one out: which number is NOT in the 8 times table? (a) 16 (b) 32 (c) 48 (d) 65
  18. 18.11 × 100 =
  19. 19.Take 896. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  20. 20.A piggy bank has 6 coins of ₹5 and 4 coins of ₹2. How many rupees are in it?
  21. 21.If today is Monday, what day was it 33 days ago? (a) Tuesday (b) Thursday (c) Saturday (d) Wednesday
  22. 22.Half of 36 =
  23. 23.?652 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.Magic trick! Think of 14. Double it, add 18, halve it, then take away 14. What number do you get?
  25. 25.Think of 15. Multiply it by 4, then add 2. What number do you end with?
  26. 26.34 × 4 =
  27. 27.What comes next? 4, 9, 16, 25, ? (a) 38 (b) 36 (c) 37 (d) 34
  28. 28.Think of 15. Multiply it by 3, then add 7. What number do you end with?
  29. 29.What comes next? 12, 16, 20, 24, ? (a) 29 (b) 28 (c) 24 (d) 32
  30. 30.1 + 2 + 3 + … + 18 =
  31. 31.Double 19 =
  32. 32.28 × ? = 2800
  33. 33.Magic square (every row, column and diagonal has the same total): 33 12 27 | 18 24 ? | 21 36 15. What is the missing number?
  34. 34.What comes next? 2, 4, 8, 16, ? (a) 33 (b) 24 (c) 32 (d) 28
  35. 35.2 × 9 =
  36. 36.9 × 4 = 3? — what is the missing digit?
  37. 37.1 + 2 + 3 + … + 61 =
  38. 38.Take 477. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  39. 39.12345679 × 27 =
  40. 40.50?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

  1. 15
  2. 4000
  3. 45
  4. 62
  5. Thursday
  6. 27
  7. Saturday
  8. 88
  9. 83
  10. 4
  11. 1089
  12. 8
  13. 40
  14. 8
  15. 44
  16. 118
  17. 65
  18. 1100
  19. 198
  20. 38
  21. Wednesday
  22. 18
  23. 5
  24. 9
  25. 62
  26. 136
  27. 36
  28. 52
  29. 28
  30. 171
  31. 38
  32. 100
  33. 30
  34. 32
  35. 18
  36. 6
  37. 1891
  38. 297
  39. 333333333
  40. 7

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