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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 532 · 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. 1.48 × 4 =
  2. 2.9 × 1 =
  3. 3.9 × 6 = ?4 — what is the missing digit?
  4. 4.1234 × 8 + 4 =
  5. 5.1 + 2 + 3 + … + 20 =
  6. 6.What comes next? 4, 8, 16, 32, ? (a) 56 (b) 64 (c) 48 (d) 65
  7. 7.Magic square (every row, column and diagonal has the same total): 14 9 10 | 7 11 15 | 12 13 ?. What is the missing number?
  8. 8.A piggy bank has 9 coins of ₹5 and 15 coins of ₹2. How many rupees are in it?
  9. 9.Half of 26 =
  10. 10.Take 96 and take away the sum of its digits. What do you get?
  11. 11.The 2nd of a month is a Thursday. What day is the 12th of the same month? (a) Saturday (b) Monday (c) Sunday (d) Wednesday
  12. 12.Double 33 =
  13. 13.12345679 × 63 =
  14. 14.753? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.12 × 4 =
  16. 16.1 + 3 + 5 + … + 15 =
  17. 17.Do the 1089 trick with 760: reverse and subtract, then reverse that answer and add. What do you get?
  18. 18.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  19. 19.9 × 6 =
  20. 20.3 × 9 =
  21. 21.If today is Thursday, what day will it be after 47 days? (a) Friday (b) Wednesday (c) Tuesday (d) Monday
  22. 22.1 + 2 + 3 + … + 10 =
  23. 23.1 + 2 + 3 + … + 56 =
  24. 24.The 2nd of a month is a Thursday. What day is the 28th of the same month? (a) Monday (b) Wednesday (c) Friday (d) Tuesday
  25. 25.What comes next? 25, 36, 49, 64, ? (a) 82 (b) 83 (c) 79 (d) 81
  26. 26.12 × 9 + 3 =
  27. 27.9 × 9 = 8? — what is the missing digit?
  28. 28.Take 68 and take away the sum of its digits. What do you get?
  29. 29.Do the 1089 trick with 136: reverse and subtract, then reverse that answer and add. What do you get?
  30. 30.I thought of a number, added 2 and then doubled it. I got 40. What was my number?
  31. 31.29 × 4 =
  32. 32.In 3 years a boy will be 14 years old. How old was he 7 years ago?
  33. 33.1234567 × 9 + 8 =
  34. 34.38 × 4 =
  35. 35.7?05 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.37 × 21 =
  37. 37.8 × 9 =
  38. 38.61?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.If today is Tuesday, what day was it 22 days ago? (a) Sunday (b) Tuesday (c) Thursday (d) Monday
  40. 40.What comes next? 5, 14, 23, 32, ? (a) 41 (b) 42 (c) 50 (d) 32

Answer key

  1. 192
  2. 9
  3. 5
  4. 9876
  5. 210
  6. 64
  7. 8
  8. 75
  9. 13
  10. 81
  11. Sunday
  12. 66
  13. 777777777
  14. 3
  15. 48
  16. 64
  17. 1089
  18. 297
  19. 54
  20. 27
  21. Tuesday
  22. 55
  23. 1596
  24. Tuesday
  25. 81
  26. 111
  27. 1
  28. 54
  29. 1089
  30. 18
  31. 116
  32. 4
  33. 11111111
  34. 152
  35. 6
  36. 777
  37. 72
  38. 2
  39. Monday
  40. 41

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