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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 169 · 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 6. I got 24. What was my number?
  2. 2.Half of 14 =
  3. 3.A piggy bank has 7 coins of ₹5 and 2 coins of ₹2. How many rupees are in it?
  4. 4.I thought of a number, added 5 and then doubled it. I got 22. What was my number?
  5. 5.1 + 2 + 3 + … + 92 =
  6. 6.1 + 3 + 5 + … + 41 =
  7. 7.9 × 8 =
  8. 8.9 × 3 = 2? — what is the missing digit?
  9. 9.1 + 2 + 3 + … + 8 =
  10. 10.Half of 142 =
  11. 11.48 × 1000 =
  12. 12.If today is Monday, what day was it 36 days ago? (a) Saturday (b) Monday (c) Wednesday (d) Sunday
  13. 13.1 + 2 + 3 + … + 27 =
  14. 14.12345679 × 36 =
  15. 15.2 × 9 =
  16. 16.58 × 4 =
  17. 17.The 3rd of a month is a Tuesday. What day is the 22nd of the same month? (a) Wednesday (b) Sunday (c) Saturday (d) Monday
  18. 18.Half of 122 =
  19. 19.1 + 2 + 3 + … + 30 =
  20. 20.8 × 9 =
  21. 21.If today is Friday, what day was it 53 days ago? (a) Sunday (b) Tuesday (c) Thursday (d) Monday
  22. 22.Magic square (every row, column and diagonal has the same total): 14 9 16 | 15 13 11 | ? 17 12. What is the missing number?
  23. 23.9 × 8 = 7? — what is the missing digit?
  24. 24.Take 53 and take away the sum of its digits. What do you get?
  25. 25.783 × ? = 7830
  26. 26.9 × 7 =
  27. 27.Magic square (every row, column and diagonal has the same total): 27 12 33 | ? 24 18 | 15 36 21. What is the missing number?
  28. 28.Do the 1089 trick with 208: reverse and subtract, then reverse that answer and add. What do you get?
  29. 29.Think of 7. Multiply it by 5, then add 6. What number do you end with?
  30. 30.9 × 6 = ?4 — what is the missing digit?
  31. 31.Half of 114 =
  32. 32.Half of 88 =
  33. 33.You have 15 coins. Each coin is ₹1 or ₹2, and together they make ₹29. How many ₹2 coins do you have?
  34. 34.Think of 9. Multiply it by 2, then add 9. What number do you end with?
  35. 35.Magic square (every row, column and diagonal has the same total): 8 ? 12 | 15 11 7 | 10 9 14. What is the missing number?
  36. 36.53?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.Magic square (every row, column and diagonal has the same total): 10 15 ? | 17 13 9 | 12 11 16. What is the missing number?
  38. 38.1 + 2 + 3 + … + 70 =
  39. 39.A girl is 10 years old and her brother is 6 years older. How old will her brother be in 7 years?
  40. 40.13 × ? = 13000

Answer key

  1. 9
  2. 7
  3. 39
  4. 6
  5. 4278
  6. 441
  7. 72
  8. 7
  9. 36
  10. 71
  11. 48000
  12. Sunday
  13. 378
  14. 444444444
  15. 18
  16. 232
  17. Sunday
  18. 61
  19. 465
  20. 72
  21. Monday
  22. 10
  23. 2
  24. 45
  25. 10
  26. 63
  27. 30
  28. 1089
  29. 41
  30. 5
  31. 57
  32. 44
  33. 14
  34. 27
  35. 13
  36. 8
  37. 14
  38. 2485
  39. 23
  40. 1000

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