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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 43 · 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. 1.9 × 6 = ?4 — what is the missing digit?
  2. 2.You have 5 coins. Each coin is ₹1 or ₹2, and together they make ₹9. How many ₹2 coins do you have?
  3. 3.1 + 2 + 3 + … + 40 =
  4. 4.37 × 6 =
  5. 5.Think of 12. Multiply it by 2, then add 6. What number do you end with?
  6. 6.Take 196. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  7. 7.1 + 2 + 3 + … + 89 =
  8. 8.You have 6 coins. Each coin is ₹1 or ₹2, and together they make ₹11. How many ₹2 coins do you have?
  9. 9.9 × 7 = ?3 — what is the missing digit?
  10. 10.1 + 2 + 3 + … + 55 =
  11. 11.In 4 years a boy will be 12 years old. How old was he 3 years ago?
  12. 12.Magic square (every row, column and diagonal has the same total): 7 17 15 | 21 ? 5 | 11 9 19. What is the missing number?
  13. 13.13 × 4 =
  14. 14.37 × 4 =
  15. 15.I thought of a number, multiplied it by 2 and added 6. I got 32. What was my number?
  16. 16.4 × 9 =
  17. 17.12345679 × 36 =
  18. 18.9 × 9 = 8? — what is the missing digit?
  19. 19.Take 13 and take away the sum of its digits. What do you get?
  20. 20.What comes next? 36, 49, 64, 81, ? (a) 101 (b) 100 (c) 98 (d) 102
  21. 21.What comes next? 16, 22, 28, 34, ? (a) 34 (b) 40 (c) 46 (d) 41
  22. 22.7 × 9 =
  23. 23.396 + 693 =
  24. 24.The 8th of a month is a Wednesday. What day is the 26th of the same month? (a) Wednesday (b) Monday (c) Saturday (d) Sunday
  25. 25.1 × 9 =
  26. 26.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
  27. 27.Magic square (every row, column and diagonal has the same total): 11 16 ? | 18 14 10 | 13 12 17. What is the missing number?
  28. 28.1 + 3 + 5 + … + 31 =
  29. 29.792 + 297 =
  30. 30.What comes next? 3, 6, 12, 24, ? (a) 48 (b) 49 (c) 42 (d) 36
  31. 31.17 × 4 =
  32. 32.Magic square (every row, column and diagonal has the same total): 26 11 32 | 29 ? 17 | 14 35 20. What is the missing number?
  33. 33.24 × 100 =
  34. 34.Take 712. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  35. 35.Half of 24 =
  36. 36.9 × 10 = ?0 — what is the missing digit?
  37. 37.19 × 100 =
  38. 38.8 × 9 =
  39. 39.Magic square (every row, column and diagonal has the same total): 17 15 25 | 27 19 11 | ? 23 21. What is the missing number?
  40. 40.495 + 594 =

Answer key

  1. 5
  2. 4
  3. 820
  4. 222
  5. 30
  6. 495
  7. 4005
  8. 5
  9. 6
  10. 1540
  11. 5
  12. 13
  13. 52
  14. 148
  15. 13
  16. 36
  17. 444444444
  18. 1
  19. 9
  20. 100
  21. 40
  22. 63
  23. 1089
  24. Sunday
  25. 9
  26. 396
  27. 15
  28. 256
  29. 1089
  30. 48
  31. 68
  32. 23
  33. 2400
  34. 495
  35. 12
  36. 9
  37. 1900
  38. 72
  39. 13
  40. 1089

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