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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 398 · 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.A father is 44 years old and his son is 6. How old was the father when the son was born?
  2. 2.111111 × 111111 =
  3. 3.?754 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.47?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.18 × 100 =
  6. 6.1 + 3 + 5 + … + 49 =
  7. 7.125 × 10 =
  8. 8.9 × 10 = 9? — what is the missing digit?
  9. 9.A piggy bank has 3 coins of ₹5 and 15 coins of ₹2. How many rupees are in it?
  10. 10.3 × 9 =
  11. 11.A father is 41 years old and his son is 11. How old was the father when the son was born?
  12. 12.What comes next? 8, 14, 20, 26, ? (a) 33 (b) 32 (c) 26 (d) 38
  13. 13.Magic square (every row, column and diagonal has the same total): 15 8 13 | 10 12 14 | 11 ? 9. What is the missing number?
  14. 14.1 + 2 + 3 + … + 49 =
  15. 15.Magic trick! Think of 15. Double it, add 4, halve it, then take away 15. What number do you get?
  16. 16.57 × 4 =
  17. 17.9 × 3 =
  18. 18.123456789 × 8 + 9 =
  19. 19.594 + 495 =
  20. 20.297 + 792 =
  21. 21.Odd one out: which number is NOT in the 9 times table? (a) 83 (b) 45 (c) 18 (d) 27
  22. 22.9 × 10 = ?0 — what is the missing digit?
  23. 23.Odd one out: which number is NOT in the 9 times table? (a) 45 (b) 72 (c) 22 (d) 18
  24. 24.48 × ? = 48000
  25. 25.Double 81 =
  26. 26.A girl is 8 years old and her brother is 4 years older. How old will her brother be in 4 years?
  27. 27.A father is 40 years old and his son is 13. How old was the father when the son was born?
  28. 28.8 × 9 =
  29. 29.Magic square (every row, column and diagonal has the same total): 12 14 4 | ? 10 18 | 16 6 8. What is the missing number?
  30. 30.1 + 2 + 3 + … + 46 =
  31. 31.Do the 1089 trick with 370: reverse and subtract, then reverse that answer and add. What do you get?
  32. 32.9 × 2 = ?8 — what is the missing digit?
  33. 33.32 × 4 =
  34. 34.9 × 10 =
  35. 35.1 × 9 =
  36. 36.1 + 2 + 3 + … + 82 =
  37. 37.9 × 9 = ?1 — what is the missing digit?
  38. 38.1 + 2 + 3 + … + 64 =
  39. 39.Double 61 =
  40. 40.11 × 11 =

Answer key

  1. 38
  2. 12345654321
  3. 2
  4. 7
  5. 1800
  6. 625
  7. 1250
  8. 0
  9. 45
  10. 27
  11. 30
  12. 32
  13. 16
  14. 1225
  15. 2
  16. 228
  17. 27
  18. 987654321
  19. 1089
  20. 1089
  21. 83
  22. 9
  23. 22
  24. 1000
  25. 162
  26. 16
  27. 27
  28. 72
  29. 2
  30. 1081
  31. 1089
  32. 1
  33. 128
  34. 90
  35. 9
  36. 3403
  37. 8
  38. 2080
  39. 122
  40. 121

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