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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 907 · 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 trick! Think of 17. Double it, add 16, halve it, then take away 17. What number do you get?
  2. 2.66 × 100 =
  3. 3.Magic square (every row, column and diagonal has the same total): 21 23 13 | 11 19 27 | 25 15 ?. What is the missing number?
  4. 4.35 × 4 =
  5. 5.9 × 10 = ?0 — what is the missing digit?
  6. 6.11 × 11 =
  7. 7.1 + 2 + 3 + … + 23 =
  8. 8.9 × 8 = ?2 — what is the missing digit?
  9. 9.53 × 4 =
  10. 10.28 × 100 =
  11. 11.Double 42 =
  12. 12.12345679 × 9 =
  13. 13.12345679 × 63 =
  14. 14.9 × 9 =
  15. 15.A father is 39 years old and his son is 8. How old was the father when the son was born?
  16. 16.5?72 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 55 and take away the sum of its digits. What do you get?
  18. 18.Half of 54 =
  19. 19.A father is 43 years old and his son is 10. How old was the father when the son was born?
  20. 20.The 9th of a month is a Sunday. What day is the 17th of the same month? (a) Thursday (b) Monday (c) Tuesday (d) Sunday
  21. 21.Half of 16 =
  22. 22.1 + 2 + 3 + … + 93 =
  23. 23.Magic square (every row, column and diagonal has the same total): 9 19 5 | 7 11 ? | 17 3 13. What is the missing number?
  24. 24.9 × 9 = 8? — what is the missing digit?
  25. 25.7 × 9 =
  26. 26.A father is 33 years old and his son is 14. How old was the father when the son was born?
  27. 27.44 × 4 =
  28. 28.19 × 4 =
  29. 29.1 + 2 + 3 + … + 16 =
  30. 30.12345679 × 18 =
  31. 31.Think of 10. Multiply it by 5, then add 9. What number do you end with?
  32. 32.Think of 7. Multiply it by 3, then add 8. What number do you end with?
  33. 33.Half of 46 =
  34. 34.1 + 2 + 3 + … + 34 =
  35. 35.What comes next? 16, 21, 26, 31, ? (a) 37 (b) 36 (c) 31 (d) 41
  36. 36.You have 15 coins. Each coin is ₹1 or ₹2, and together they make ₹28. How many ₹2 coins do you have?
  37. 37.I thought of a number, multiplied it by 2 and added 9. I got 13. What was my number?
  38. 38.The 3rd of a month is a Thursday. What day is the 25th of the same month? (a) Thursday (b) Saturday (c) Monday (d) Friday
  39. 39.Half of 44 =
  40. 40.9 × 2 =

Answer key

  1. 8
  2. 6600
  3. 17
  4. 140
  5. 9
  6. 121
  7. 276
  8. 7
  9. 212
  10. 2800
  11. 84
  12. 111111111
  13. 777777777
  14. 81
  15. 31
  16. 4
  17. 45
  18. 27
  19. 33
  20. Monday
  21. 8
  22. 4371
  23. 15
  24. 1
  25. 63
  26. 19
  27. 176
  28. 76
  29. 136
  30. 222222222
  31. 59
  32. 29
  33. 23
  34. 595
  35. 36
  36. 13
  37. 2
  38. Friday
  39. 22
  40. 18

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