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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 864 · 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.Magic square (every row, column and diagonal has the same total): 11 12 7 | 6 10 14 | 13 ? 9. What is the missing number?
  2. 2.9 × 8 =
  3. 3.I thought of a number, added 5 and then doubled it. I got 34. What was my number?
  4. 4.9 × 2 = ?8 — what is the missing digit?
  5. 5.57 × 4 =
  6. 6.If today is Monday, what day was it 13 days ago? (a) Monday (b) Wednesday (c) Tuesday (d) Friday
  7. 7.Take 46 and take away the sum of its digits. What do you get?
  8. 8.9 × 6 = ?4 — what is the missing digit?
  9. 9.What comes next? 1, 2, 4, 8, ? (a) 12 (b) 14 (c) 16 (d) 17
  10. 10.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
  11. 11.9 × 6 = 5? — what is the missing digit?
  12. 12.I thought of a number, added 4 and then doubled it. I got 46. What was my number?
  13. 13.1 + 3 + 5 + … + 23 =
  14. 14.819 × 10 =
  15. 15.You have 11 coins. Each coin is ₹1 or ₹2, and together they make ₹13. How many ₹2 coins do you have?
  16. 16.The 6th of a month is a Tuesday. What day is the 25th of the same month? (a) Wednesday (b) Monday (c) Saturday (d) Sunday
  17. 17.1 + 2 + 3 + … + 59 =
  18. 18.9 × 10 = ?0 — what is the missing digit?
  19. 19.35 × ? = 3500
  20. 20.9 × 4 =
  21. 21.The 5th of a month is a Monday. What day is the 20th of the same month? (a) Wednesday (b) Monday (c) Tuesday (d) Friday
  22. 22.The 8th of a month is a Thursday. What day is the 16th of the same month? (a) Monday (b) Saturday (c) Friday (d) Thursday
  23. 23.Magic square (every row, column and diagonal has the same total): 8 22 ? | 18 14 10 | 16 6 20. What is the missing number?
  24. 24.9 × 7 = ?3 — what is the missing digit?
  25. 25.The ages of two twins add up to 28. How old is each twin?
  26. 26.Take 65 and take away the sum of its digits. What do you get?
  27. 27.Think of 7. Multiply it by 5, then add 3. What number do you end with?
  28. 28.Magic square (every row, column and diagonal has the same total): ? 24 21 | 30 18 6 | 15 12 27. What is the missing number?
  29. 29.1 + 2 + 3 + … + 7 =
  30. 30.9 × 3 = 2? — what is the missing digit?
  31. 31.Magic square (every row, column and diagonal has the same total): ? 11 6 | 9 7 5 | 8 3 10. What is the missing number?
  32. 32.Do the 1089 trick with 638: reverse and subtract, then reverse that answer and add. What do you get?
  33. 33.Half of 42 =
  34. 34.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
  35. 35.Do the 1089 trick with 925: reverse and subtract, then reverse that answer and add. What do you get?
  36. 36.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
  37. 37.18 × 4 =
  38. 38.17 × 4 =
  39. 39.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  40. 40.9 × 9 =

Answer key

  1. 8
  2. 72
  3. 12
  4. 1
  5. 228
  6. Tuesday
  7. 36
  8. 5
  9. 16
  10. 594
  11. 4
  12. 19
  13. 144
  14. 8190
  15. 2
  16. Sunday
  17. 1770
  18. 9
  19. 100
  20. 36
  21. Tuesday
  22. Friday
  23. 12
  24. 6
  25. 14
  26. 54
  27. 38
  28. 9
  29. 28
  30. 7
  31. 4
  32. 1089
  33. 21
  34. 792
  35. 1089
  36. 396
  37. 72
  38. 68
  39. 297
  40. 81

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