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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 543 · 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. 1.13 × 4 =
  2. 2.Magic square (every row, column and diagonal has the same total): 32 ? 20 | 11 23 35 | 26 29 14. What is the missing number?
  3. 3.9 × 9 = 8? — what is the missing digit?
  4. 4.A girl is 5 years old and her brother is 3 years older. How old will her brother be in 9 years?
  5. 5.Half of 138 =
  6. 6.9 × 8 = ?2 — what is the missing digit?
  7. 7.Magic square (every row, column and diagonal has the same total): 26 11 14 | 5 17 ? | 20 23 8. What is the missing number?
  8. 8.?37 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.1234567 × 8 + 7 =
  10. 10.If today is Tuesday, what day will it be after 62 days? (a) Thursday (b) Monday (c) Sunday (d) Tuesday
  11. 11.A girl is 7 years old and her brother is 6 years older. How old will her brother be in 5 years?
  12. 12.If today is Saturday, what day will it be after 15 days? (a) Wednesday (b) Sunday (c) Monday (d) Saturday
  13. 13.7 × 4 =
  14. 14.9 × 4 = 3? — what is the missing digit?
  15. 15.1 + 2 + 3 + … + 73 =
  16. 16.A piggy bank has 12 coins of ₹5 and 9 coins of ₹2. How many rupees are in it?
  17. 17.1234 × 8 + 4 =
  18. 18.Take 42 and take away the sum of its digits. What do you get?
  19. 19.33 × 4 =
  20. 20.31 × 4 =
  21. 21.1 + 3 + 5 + … + 49 =
  22. 22.1234 × 9 + 5 =
  23. 23.Take 678. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  24. 24.I thought of a number, multiplied it by 5 and added 7. I got 77. What was my number?
  25. 25.9 × 2 =
  26. 26.25 × 4 =
  27. 27.9 × 9 =
  28. 28.1 + 2 + 3 + … + 6 =
  29. 29.9 × 4 = ?6 — what is the missing digit?
  30. 30.Take 36 and take away the sum of its digits. What do you get?
  31. 31.847 × ? = 8470
  32. 32.What comes next? 25, 36, 49, 64, ? (a) 83 (b) 82 (c) 81 (d) 79
  33. 33.11111 × 11111 =
  34. 34.Magic trick! Think of 20. Double it, add 10, halve it, then take away 20. What number do you get?
  35. 35.A girl is 8 years old and her brother is 3 years older. How old will her brother be in 8 years?
  36. 36.1 + 3 + 5 + … + 11 =
  37. 37.9 × 10 = ?0 — what is the missing digit?
  38. 38.Do the 1089 trick with 127: reverse and subtract, then reverse that answer and add. What do you get?
  39. 39.9 × 5 = 4? — what is the missing digit?
  40. 40.9 × 7 = 6? — what is the missing digit?

Answer key

  1. 52
  2. 17
  3. 1
  4. 17
  5. 69
  6. 7
  7. 29
  8. 8
  9. 9876543
  10. Monday
  11. 18
  12. Sunday
  13. 28
  14. 6
  15. 2701
  16. 78
  17. 9876
  18. 36
  19. 132
  20. 124
  21. 625
  22. 11111
  23. 198
  24. 14
  25. 18
  26. 100
  27. 81
  28. 21
  29. 3
  30. 27
  31. 10
  32. 81
  33. 123454321
  34. 5
  35. 19
  36. 36
  37. 9
  38. 1089
  39. 5
  40. 3

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