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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 542 · 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. 1.8 × 9 =
  2. 2.Think of 6. Multiply it by 5, then add 5. What number do you end with?
  3. 3.Half of 54 =
  4. 4.1 + 2 + 3 + … + 45 =
  5. 5.A father is 37 years old and his son is 6. How old was the father when the son was born?
  6. 6.37 × 27 =
  7. 7.If today is Wednesday, what day was it 34 days ago? (a) Sunday (b) Wednesday (c) Thursday (d) Friday
  8. 8.What comes next? 25, 36, 49, 64, ? (a) 82 (b) 79 (c) 83 (d) 81
  9. 9.Think of 6. Multiply it by 4, then add 9. What number do you end with?
  10. 10.What comes next? 4, 8, 12, 16, ? (a) 20 (b) 21 (c) 24 (d) 16
  11. 11.11 × 11 =
  12. 12.A father is 35 years old and his son is 6. How old was the father when the son was born?
  13. 13.A piggy bank has 2 coins of ₹5 and 13 coins of ₹2. How many rupees are in it?
  14. 14.Magic square (every row, column and diagonal has the same total): 8 22 12 | 18 14 10 | ? 6 20. What is the missing number?
  15. 15.You have 12 coins. Each coin is ₹1 or ₹2, and together they make ₹23. How many ₹2 coins do you have?
  16. 16.Odd one out: which number is NOT in the 6 times table? (a) 12 (b) 18 (c) 30 (d) 17
  17. 17.1234567 × 9 + 8 =
  18. 18.You have 15 coins. Each coin is ₹1 or ₹2, and together they make ₹25. How many ₹2 coins do you have?
  19. 19.I thought of a number, added 5 and then doubled it. I got 20. What was my number?
  20. 20.1 + 2 + 3 + … + 53 =
  21. 21.59?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.1 × 9 =
  23. 23.Take 46 and take away the sum of its digits. What do you get?
  24. 24.40 × 100 =
  25. 25.45 × 4 =
  26. 26.What comes next? 9, 16, 25, 36, ? (a) 51 (b) 47 (c) 49 (d) 50
  27. 27.9 × 3 =
  28. 28.Half of 138 =
  29. 29.Double 34 =
  30. 30.I thought of a number, multiplied it by 3 and added 5. I got 14. What was my number?
  31. 31.Magic square (every row, column and diagonal has the same total): 25 28 13 | 10 22 ? | 31 16 19. What is the missing number?
  32. 32.Magic square (every row, column and diagonal has the same total): ? 8 18 | 20 12 4 | 6 16 14. What is the missing number?
  33. 33.Magic square (every row, column and diagonal has the same total): 25 ? 13 | 4 16 28 | 19 22 7. What is the missing number?
  34. 34.65?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.792 + 297 =
  36. 36.9 × 8 = ?2 — what is the missing digit?
  37. 37.Double 85 =
  38. 38.Think of 5. Multiply it by 2, then add 5. What number do you end with?
  39. 39.Do the 1089 trick with 820: reverse and subtract, then reverse that answer and add. What do you get?
  40. 40.Take 571. Reverse its digits and take the smaller number away from the bigger one. What do you get?

Answer key

  1. 72
  2. 35
  3. 27
  4. 1035
  5. 31
  6. 999
  7. Thursday
  8. 81
  9. 33
  10. 20
  11. 121
  12. 29
  13. 36
  14. 16
  15. 11
  16. 17
  17. 11111111
  18. 10
  19. 5
  20. 1431
  21. 2
  22. 9
  23. 36
  24. 4000
  25. 180
  26. 49
  27. 27
  28. 69
  29. 68
  30. 3
  31. 34
  32. 10
  33. 10
  34. 1
  35. 1089
  36. 7
  37. 170
  38. 15
  39. 1089
  40. 396

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