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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 824 · 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. 1.10 × 9 =
  2. 2.What comes next? 3, 6, 12, 24, ? (a) 48 (b) 42 (c) 36 (d) 49
  3. 3.9 × 3 = ?7 — what is the missing digit?
  4. 4.8 × 9 =
  5. 5.Double 21 =
  6. 6.9 × 6 = ?4 — what is the missing digit?
  7. 7.1 + 2 + 3 + … + 49 =
  8. 8.What comes next? 9, 16, 25, 36, ? (a) 49 (b) 50 (c) 47 (d) 51
  9. 9.I thought of a number, multiplied it by 3 and added 4. I got 43. What was my number?
  10. 10.1 + 3 + 5 + … + 17 =
  11. 11.8?32 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Magic square (every row, column and diagonal has the same total): 14 9 10 | ? 11 15 | 12 13 8. What is the missing number?
  13. 13.You have 11 coins. Each coin is ₹1 or ₹2, and together they make ₹18. How many ₹2 coins do you have?
  14. 14.A father is 34 years old and his son is 11. How old was the father when the son was born?
  15. 15.657 × ? = 6570
  16. 16.If today is Thursday, what day was it 57 days ago? (a) Wednesday (b) Saturday (c) Tuesday (d) Thursday
  17. 17.9 × 3 =
  18. 18.9 × 2 = ?8 — what is the missing digit?
  19. 19.Take 12 and take away the sum of its digits. What do you get?
  20. 20.9 × 7 = 6? — what is the missing digit?
  21. 21.111 × 111 =
  22. 22.23?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.27 × 4 =
  24. 24.I thought of a number, multiplied it by 2 and added 7. I got 27. What was my number?
  25. 25.14 × 4 =
  26. 26.Magic square (every row, column and diagonal has the same total): 4 3 8 | ? 5 1 | 2 7 6. What is the missing number?
  27. 27.Double 58 =
  28. 28.You have 8 coins. Each coin is ₹1 or ₹2, and together they make ₹14. How many ₹2 coins do you have?
  29. 29.Magic square (every row, column and diagonal has the same total): ? 9 12 | 3 15 27 | 18 21 6. What is the missing number?
  30. 30.What comes next? 18, 20, 22, 24, ? (a) 26 (b) 27 (c) 24 (d) 28
  31. 31.Double 28 =
  32. 32.651? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.9 × 2 = 1? — what is the missing digit?
  34. 34.9 × 7 = ?3 — what is the missing digit?
  35. 35.9 × 2 =
  36. 36.37 × 24 =
  37. 37.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
  38. 38.Magic square (every row, column and diagonal has the same total): 13 15 5 | 3 11 19 | ? 7 9. What is the missing number?
  39. 39.What comes next? 6, 14, 22, 30, ? (a) 46 (b) 30 (c) 38 (d) 39
  40. 40.1 + 2 + 3 + … + 63 =

Answer key

  1. 90
  2. 48
  3. 2
  4. 72
  5. 42
  6. 5
  7. 1225
  8. 49
  9. 13
  10. 81
  11. 5
  12. 7
  13. 7
  14. 23
  15. 10
  16. Wednesday
  17. 27
  18. 1
  19. 9
  20. 3
  21. 12321
  22. 4
  23. 108
  24. 10
  25. 56
  26. 9
  27. 116
  28. 6
  29. 24
  30. 26
  31. 56
  32. 6
  33. 8
  34. 6
  35. 18
  36. 888
  37. 198
  38. 17
  39. 38
  40. 2016

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