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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 734 · 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 × 10 = ?0 — what is the missing digit?
  2. 2.18 × 4 =
  3. 3.Do the 1089 trick with 571: reverse and subtract, then reverse that answer and add. What do you get?
  4. 4.The 4th of a month is a Wednesday. What day is the 22nd of the same month? (a) Wednesday (b) Monday (c) Saturday (d) Sunday
  5. 5.If today is Monday, what day will it be after 20 days? (a) Sunday (b) Saturday (c) Wednesday (d) Monday
  6. 6.In 2 years a boy will be 14 years old. How old was he 3 years ago?
  7. 7.Think of 7. Multiply it by 2, then add 4. What number do you end with?
  8. 8.9 × 4 = ?6 — what is the missing digit?
  9. 9.Magic trick! Think of 18. Double it, add 16, halve it, then take away 18. What number do you get?
  10. 10.Take 113. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  11. 11.37 × 3 =
  12. 12.Take 38 and take away the sum of its digits. What do you get?
  13. 13.Do the 1089 trick with 900: reverse and subtract, then reverse that answer and add. What do you get?
  14. 14.296 × ? = 2960
  15. 15.If today is Monday, what day was it 11 days ago? (a) Thursday (b) Friday (c) Sunday (d) Wednesday
  16. 16.111111 × 111111 =
  17. 17.Magic trick! Think of 13. Double it, add 6, halve it, then take away 13. What number do you get?
  18. 18.12345678 × 8 + 8 =
  19. 19.25?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.50 × 1000 =
  21. 21.10 × 9 =
  22. 22.47 × 4 =
  23. 23.9 × 9 =
  24. 24.What comes next? 1, 2, 4, 8, ? (a) 12 (b) 16 (c) 14 (d) 17
  25. 25.1 + 3 + 5 + … + 23 =
  26. 26.In 4 years a boy will be 18 years old. How old was he 7 years ago?
  27. 27.A piggy bank has 6 coins of ₹5 and 7 coins of ₹2. How many rupees are in it?
  28. 28.66 × ? = 6600
  29. 29.Take 640. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  30. 30.A piggy bank has 6 coins of ₹5 and 13 coins of ₹2. How many rupees are in it?
  31. 31.12345679 × 36 =
  32. 32.What comes next? 12, 15, 18, 21, ? (a) 24 (b) 21 (c) 25 (d) 27
  33. 33.198 + 891 =
  34. 34.846 × 10 =
  35. 35.?349 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.1 + 2 + 3 + … + 10 =
  37. 37.If today is Tuesday, what day was it 16 days ago? (a) Wednesday (b) Saturday (c) Sunday (d) Monday
  38. 38.What comes next? 1, 4, 9, 16, ? (a) 25 (b) 27 (c) 23 (d) 26
  39. 39.13 × 4 =
  40. 40.Do the 1089 trick with 290: reverse and subtract, then reverse that answer and add. What do you get?

Answer key

  1. 9
  2. 72
  3. 1089
  4. Sunday
  5. Sunday
  6. 9
  7. 18
  8. 3
  9. 8
  10. 198
  11. 111
  12. 27
  13. 1089
  14. 10
  15. Thursday
  16. 12345654321
  17. 3
  18. 98765432
  19. 7
  20. 50000
  21. 90
  22. 188
  23. 81
  24. 16
  25. 144
  26. 7
  27. 44
  28. 100
  29. 594
  30. 56
  31. 444444444
  32. 24
  33. 1089
  34. 8460
  35. 2
  36. 55
  37. Sunday
  38. 25
  39. 52
  40. 1089

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