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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 401 · 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.A piggy bank has 3 coins of ₹5 and 3 coins of ₹2. How many rupees are in it?
  2. 2.10 × 9 =
  3. 3.Magic trick! Think of 3. Double it, add 16, halve it, then take away 3. What number do you get?
  4. 4.Magic square (every row, column and diagonal has the same total): 14 11 26 | ? 17 5 | 8 23 20. What is the missing number?
  5. 5.I thought of a number, multiplied it by 2 and added 7. I got 13. What was my number?
  6. 6.Magic square (every row, column and diagonal has the same total): 11 ? 7 | 9 13 17 | 19 5 15. What is the missing number?
  7. 7.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  8. 8.Odd one out: which number is NOT in the 7 times table? (a) 35 (b) 49 (c) 25 (d) 21
  9. 9.9 × 5 = 4? — what is the missing digit?
  10. 10.Magic trick! Think of 20. Double it, add 18, halve it, then take away 20. What number do you get?
  11. 11.56 × 4 =
  12. 12.1 + 3 + 5 + … + 27 =
  13. 13.9 × 9 =
  14. 14.I thought of a number, multiplied it by 3 and added 1. I got 10. What was my number?
  15. 15.11 × 4 =
  16. 16.9 × 6 = 5? — what is the missing digit?
  17. 17.?343 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.23 × 4 =
  19. 19.If today is Saturday, what day will it be after 61 days? (a) Friday (b) Thursday (c) Wednesday (d) Sunday
  20. 20.9 × 3 = 2? — what is the missing digit?
  21. 21.What comes next? 3, 6, 12, 24, ? (a) 42 (b) 36 (c) 49 (d) 48
  22. 22.486? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Magic square (every row, column and diagonal has the same total): 24 27 12 | ? 21 33 | 30 15 18. What is the missing number?
  24. 24.9 × 10 = ?0 — what is the missing digit?
  25. 25.If today is Tuesday, what day will it be after 86 days? (a) Sunday (b) Thursday (c) Wednesday (d) Friday
  26. 26.12345679 × 9 =
  27. 27.What comes next? 9, 16, 25, 36, ? (a) 50 (b) 47 (c) 49 (d) 51
  28. 28.I thought of a number, multiplied it by 2 and added 6. I got 14. What was my number?
  29. 29.8 × 9 =
  30. 30.1 + 2 + 3 + … + 68 =
  31. 31.Half of 46 =
  32. 32.If today is Saturday, what day will it be after 46 days? (a) Saturday (b) Tuesday (c) Thursday (d) Wednesday
  33. 33.51?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.9 × 3 = ?7 — what is the missing digit?
  35. 35.15 × 4 =
  36. 36.1 × 9 =
  37. 37.1 + 3 + 5 + … + 47 =
  38. 38.9 × 7 = ?3 — what is the missing digit?
  39. 39.Odd one out: which number is NOT in the 4 times table? (a) 12 (b) 35 (c) 20 (d) 32
  40. 40.Odd one out: which number is NOT in the 4 times table? (a) 8 (b) 20 (c) 15 (d) 28

Answer key

  1. 21
  2. 90
  3. 8
  4. 29
  5. 3
  6. 21
  7. 693
  8. 25
  9. 5
  10. 9
  11. 224
  12. 196
  13. 81
  14. 3
  15. 44
  16. 4
  17. 8
  18. 92
  19. Thursday
  20. 7
  21. 48
  22. 9
  23. 9
  24. 9
  25. Thursday
  26. 111111111
  27. 49
  28. 4
  29. 72
  30. 2346
  31. 23
  32. Wednesday
  33. 3
  34. 2
  35. 60
  36. 9
  37. 576
  38. 6
  39. 35
  40. 15

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