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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 712 · 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 =
  2. 2.32 × 4 =
  3. 3.755 × ? = 7550
  4. 4.8 × 9 =
  5. 5.1 + 2 + 3 + … + 76 =
  6. 6.Magic square (every row, column and diagonal has the same total): 21 18 33 | 36 ? 12 | 15 30 27. What is the missing number?
  7. 7.59 × 4 =
  8. 8.123456 × 9 + 7 =
  9. 9.A piggy bank has 8 coins of ₹5 and 14 coins of ₹2. How many rupees are in it?
  10. 10.Do the 1089 trick with 587: reverse and subtract, then reverse that answer and add. What do you get?
  11. 11.Half of 196 =
  12. 12.If today is Sunday, what day will it be after 64 days? (a) Tuesday (b) Thursday (c) Monday (d) Sunday
  13. 13.9 × 7 = ?3 — what is the missing digit?
  14. 14.1 + 2 + 3 + … + 90 =
  15. 15.1 + 3 + 5 + … + 23 =
  16. 16.792 + 297 =
  17. 17.11 × 11 =
  18. 18.?998 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.Odd one out: which number is NOT in the 4 times table? (a) 24 (b) 35 (c) 12 (d) 16
  20. 20.Think of 10. Multiply it by 5, then add 9. What number do you end with?
  21. 21.9 × 6 = 5? — what is the missing digit?
  22. 22.?190 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Magic trick! Think of 14. Double it, add 16, halve it, then take away 14. What number do you get?
  24. 24.If today is Wednesday, what day was it 55 days ago? (a) Thursday (b) Wednesday (c) Friday (d) Sunday
  25. 25.Take 438. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  26. 26.12345679 × 72 =
  27. 27.9 × 2 = ?8 — what is the missing digit?
  28. 28.What comes next? 12, 20, 28, 36, ? (a) 52 (b) 44 (c) 36 (d) 45
  29. 29.Take 32 and take away the sum of its digits. What do you get?
  30. 30.6 × 9 =
  31. 31.1 + 2 + 3 + … + 29 =
  32. 32.9 × 9 =
  33. 33.12345679 × 9 =
  34. 34.25 × 4 =
  35. 35.If today is Thursday, what day will it be after 27 days? (a) Thursday (b) Saturday (c) Tuesday (d) Wednesday
  36. 36.Think of 4. Multiply it by 4, then add 8. What number do you end with?
  37. 37.58 × 4 =
  38. 38.9 × 4 = ?6 — what is the missing digit?
  39. 39.9 × 9 = ?1 — what is the missing digit?
  40. 40.4 × 9 =

Answer key

  1. 90
  2. 128
  3. 10
  4. 72
  5. 2926
  6. 24
  7. 236
  8. 1111111
  9. 68
  10. 1089
  11. 98
  12. Monday
  13. 6
  14. 4095
  15. 144
  16. 1089
  17. 121
  18. 1
  19. 35
  20. 59
  21. 4
  22. 8
  23. 8
  24. Thursday
  25. 396
  26. 888888888
  27. 1
  28. 44
  29. 27
  30. 54
  31. 435
  32. 81
  33. 111111111
  34. 100
  35. Wednesday
  36. 24
  37. 232
  38. 3
  39. 8
  40. 36

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