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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 261 · 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. 1.1 + 2 + 3 + … + 62 =
  2. 2.?253 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.2 × 9 =
  4. 4.4?30 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.10 × 9 =
  6. 6.9 × 9 = ?1 — what is the missing digit?
  7. 7.9 × 1 =
  8. 8.4 × 9 =
  9. 9.1 + 3 + 5 + … + 49 =
  10. 10.The 4th of a month is a Friday. What day is the 13th of the same month? (a) Wednesday (b) Sunday (c) Saturday (d) Monday
  11. 11.11111 × 11111 =
  12. 12.9 × 5 =
  13. 13.Magic trick! Think of 12. Double it, add 10, halve it, then take away 12. What number do you get?
  14. 14.You have 10 coins. Each coin is ₹1 or ₹2, and together they make ₹11. How many ₹2 coins do you have?
  15. 15.The 2nd of a month is a Monday. What day is the 13th of the same month? (a) Monday (b) Saturday (c) Friday (d) Thursday
  16. 16.1 + 2 + 3 + … + 39 =
  17. 17.The 3rd of a month is a Sunday. What day is the 11th of the same month? (a) Thursday (b) Monday (c) Tuesday (d) Sunday
  18. 18.693 + 396 =
  19. 19.If today is Saturday, what day will it be after 23 days? (a) Monday (b) Sunday (c) Tuesday (d) Thursday
  20. 20.The ages of two twins add up to 26. How old is each twin?
  21. 21.9 × 8 = ?2 — what is the missing digit?
  22. 22.A father is 36 years old and his son is 6. How old was the father when the son was born?
  23. 23.Half of 172 =
  24. 24.33 × ? = 3300
  25. 25.Think of 4. Multiply it by 2, then add 8. What number do you end with?
  26. 26.Magic trick! Think of 20. Double it, add 4, halve it, then take away 20. What number do you get?
  27. 27.Half of 152 =
  28. 28.Magic square (every row, column and diagonal has the same total): 14 29 ? | 35 23 11 | 20 17 32. What is the missing number?
  29. 29.What comes next? 25, 36, 49, 64, ? (a) 83 (b) 81 (c) 79 (d) 82
  30. 30.What comes next? 12, 20, 28, 36, ? (a) 52 (b) 45 (c) 44 (d) 36
  31. 31.55 × 4 =
  32. 32.594 + 495 =
  33. 33.9 × 4 = 3? — what is the missing digit?
  34. 34.1 + 3 + 5 + … + 9 =
  35. 35.What comes next? 5, 10, 20, 40, ? (a) 80 (b) 81 (c) 70 (d) 60
  36. 36.9 × 10 =
  37. 37.Take 24 and take away the sum of its digits. What do you get?
  38. 38.Double 33 =
  39. 39.Magic square (every row, column and diagonal has the same total): 24 9 ? | 27 21 15 | 12 33 18. What is the missing number?
  40. 40.What comes next? 1, 4, 9, 16, ? (a) 26 (b) 27 (c) 25 (d) 23

Answer key

  1. 1953
  2. 8
  3. 18
  4. 2
  5. 90
  6. 8
  7. 9
  8. 36
  9. 625
  10. Sunday
  11. 123454321
  12. 45
  13. 5
  14. 1
  15. Friday
  16. 780
  17. Monday
  18. 1089
  19. Monday
  20. 13
  21. 7
  22. 30
  23. 86
  24. 100
  25. 16
  26. 2
  27. 76
  28. 26
  29. 81
  30. 44
  31. 220
  32. 1089
  33. 6
  34. 25
  35. 80
  36. 90
  37. 18
  38. 66
  39. 30
  40. 25

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