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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 664 · 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 2. I got 12. What was my number?
  2. 2.9 × 5 =
  3. 3.9 × 6 = 5? — what is the missing digit?
  4. 4.10 × 9 =
  5. 5.12 × 9 + 3 =
  6. 6.9 × 5 = 4? — what is the missing digit?
  7. 7.Magic square (every row, column and diagonal has the same total): 25 10 13 | ? 16 28 | 19 22 7. What is the missing number?
  8. 8.54 × 4 =
  9. 9.1 + 3 + 5 + … + 49 =
  10. 10.What comes next? 36, 49, 64, 81, ? (a) 102 (b) 101 (c) 100 (d) 98
  11. 11.Do the 1089 trick with 318: reverse and subtract, then reverse that answer and add. What do you get?
  12. 12.The 1st of a month is a Saturday. What day is the 30th of the same month? (a) Saturday (b) Wednesday (c) Sunday (d) Monday
  13. 13.9 × 2 = 1? — what is the missing digit?
  14. 14.Do the 1089 trick with 643: reverse and subtract, then reverse that answer and add. What do you get?
  15. 15.If today is Tuesday, what day will it be after 91 days? (a) Wednesday (b) Tuesday (c) Friday (d) Monday
  16. 16.What comes next? 3, 6, 12, 24, ? (a) 42 (b) 49 (c) 36 (d) 48
  17. 17.9 × 5 = ?5 — what is the missing digit?
  18. 18.Take 65 and take away the sum of its digits. What do you get?
  19. 19.If today is Friday, what day was it 25 days ago? (a) Tuesday (b) Thursday (c) Sunday (d) Monday
  20. 20.Magic square (every row, column and diagonal has the same total): 12 5 10 | 7 9 11 | ? 13 6. What is the missing number?
  21. 21.20 × 4 =
  22. 22.Odd one out: which number is NOT in the 5 times table? (a) 25 (b) 20 (c) 35 (d) 49
  23. 23.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
  24. 24.27 × 4 =
  25. 25.You have 7 coins. Each coin is ₹1 or ₹2, and together they make ₹10. How many ₹2 coins do you have?
  26. 26.Take 410. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  27. 27.I thought of a number, added 7 and then doubled it. I got 44. What was my number?
  28. 28.Double 44 =
  29. 29.Magic square (every row, column and diagonal has the same total): 6 ? 12 | 21 15 9 | 18 3 24. What is the missing number?
  30. 30.Take 107. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  31. 31.1 × 9 =
  32. 32.9 × 3 =
  33. 33.Magic square (every row, column and diagonal has the same total): 12 ? 8 | 10 14 18 | 20 6 16. What is the missing number?
  34. 34.If today is Wednesday, what day was it 50 days ago? (a) Friday (b) Monday (c) Tuesday (d) Wednesday
  35. 35.32 × 4 =
  36. 36.11 × 4 =
  37. 37.37 × 15 =
  38. 38.Half of 198 =
  39. 39.Think of 12. Multiply it by 5, then add 3. What number do you end with?
  40. 40.Odd one out: which number is NOT in the 6 times table? (a) 24 (b) 60 (c) 23 (d) 42

Answer key

  1. 5
  2. 45
  3. 4
  4. 90
  5. 111
  6. 5
  7. 4
  8. 216
  9. 625
  10. 100
  11. 1089
  12. Sunday
  13. 8
  14. 1089
  15. Tuesday
  16. 48
  17. 4
  18. 54
  19. Monday
  20. 8
  21. 80
  22. 49
  23. 792
  24. 108
  25. 3
  26. 396
  27. 15
  28. 88
  29. 27
  30. 594
  31. 9
  32. 27
  33. 22
  34. Tuesday
  35. 128
  36. 44
  37. 555
  38. 99
  39. 63
  40. 23

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