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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 546 · 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.Do the 1089 trick with 781: reverse and subtract, then reverse that answer and add. What do you get?
  2. 2.9 × 6 =
  3. 3.41 × 1000 =
  4. 4.1 + 3 + 5 + … + 49 =
  5. 5.A piggy bank has 9 coins of ₹5 and 8 coins of ₹2. How many rupees are in it?
  6. 6.Take 980. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  7. 7.9 × 2 = ?8 — what is the missing digit?
  8. 8.111111 × 111111 =
  9. 9.Magic square (every row, column and diagonal has the same total): ? 4 9 | 10 6 2 | 3 8 7. What is the missing number?
  10. 10.Magic square (every row, column and diagonal has the same total): 13 23 9 | 11 15 19 | ? 7 17. What is the missing number?
  11. 11.3 × 9 =
  12. 12.Magic square (every row, column and diagonal has the same total): 8 13 6 | ? 9 11 | 12 5 10. What is the missing number?
  13. 13.Double 17 =
  14. 14.In 3 years a boy will be 16 years old. How old was he 2 years ago?
  15. 15.Do the 1089 trick with 385: reverse and subtract, then reverse that answer and add. What do you get?
  16. 16.587? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.9 × 8 = ?2 — what is the missing digit?
  18. 18.12345679 × 54 =
  19. 19.9 × 10 = 9? — what is the missing digit?
  20. 20.Half of 96 =
  21. 21.Half of 12 =
  22. 22.Do the 1089 trick with 950: reverse and subtract, then reverse that answer and add. What do you get?
  23. 23.You have 15 coins. Each coin is ₹1 or ₹2, and together they make ₹18. How many ₹2 coins do you have?
  24. 24.Double 86 =
  25. 25.8 × 9 =
  26. 26.Do the 1089 trick with 972: reverse and subtract, then reverse that answer and add. What do you get?
  27. 27.Magic square (every row, column and diagonal has the same total): ? 6 21 | 12 18 24 | 15 30 9. What is the missing number?
  28. 28.Magic trick! Think of 4. Double it, add 14, halve it, then take away 4. What number do you get?
  29. 29.Magic square (every row, column and diagonal has the same total): 13 ? 9 | 8 12 16 | 15 10 11. What is the missing number?
  30. 30.111 × 111 =
  31. 31.1234 × 8 + 4 =
  32. 32.36 × 100 =
  33. 33.I thought of a number, multiplied it by 4 and added 4. I got 28. What was my number?
  34. 34.6 × 4 =
  35. 35.Magic trick! Think of 14. Double it, add 4, halve it, then take away 14. What number do you get?
  36. 36.40 × 4 =
  37. 37.20 × 4 =
  38. 38.The 1st of a month is a Friday. What day is the 20th of the same month? (a) Wednesday (b) Saturday (c) Thursday (d) Tuesday
  39. 39.The 8th of a month is a Wednesday. What day is the 22nd of the same month? (a) Saturday (b) Tuesday (c) Wednesday (d) Thursday
  40. 40.2 × 9 =

Answer key

  1. 1089
  2. 54
  3. 41000
  4. 625
  5. 61
  6. 891
  7. 1
  8. 12345654321
  9. 5
  10. 21
  11. 27
  12. 7
  13. 34
  14. 11
  15. 1089
  16. 7
  17. 7
  18. 666666666
  19. 0
  20. 48
  21. 6
  22. 1089
  23. 3
  24. 172
  25. 72
  26. 1089
  27. 27
  28. 7
  29. 14
  30. 12321
  31. 9876
  32. 3600
  33. 6
  34. 24
  35. 2
  36. 160
  37. 80
  38. Wednesday
  39. Wednesday
  40. 18

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