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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 159 · 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. 1.55 × 4 =
  2. 2.1 + 2 + 3 + … + 94 =
  3. 3.4?26 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.9 × 4 = ?6 — what is the missing digit?
  5. 5.67 × 100 =
  6. 6.Take 29 and take away the sum of its digits. What do you get?
  7. 7.766? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.1 + 3 + 5 + … + 31 =
  9. 9.If today is Wednesday, what day will it be after 91 days? (a) Tuesday (b) Thursday (c) Wednesday (d) Saturday
  10. 10.Take 34 and take away the sum of its digits. What do you get?
  11. 11.35 × 4 =
  12. 12.If today is Monday, what day will it be after 18 days? (a) Friday (b) Thursday (c) Monday (d) Saturday
  13. 13.A father is 36 years old and his son is 5. How old was the father when the son was born?
  14. 14.A piggy bank has 7 coins of ₹5 and 7 coins of ₹2. How many rupees are in it?
  15. 15.111 × 111 =
  16. 16.A piggy bank has 6 coins of ₹5 and 7 coins of ₹2. How many rupees are in it?
  17. 17.63?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.Magic square (every row, column and diagonal has the same total): 17 7 21 | 19 15 11 | 9 23 ?. What is the missing number?
  19. 19.If today is Sunday, what day was it 33 days ago? (a) Tuesday (b) Wednesday (c) Friday (d) Monday
  20. 20.11 × 11 =
  21. 21.9 × 4 =
  22. 22.Do the 1089 trick with 931: reverse and subtract, then reverse that answer and add. What do you get?
  23. 23.If today is Tuesday, what day will it be after 36 days? (a) Tuesday (b) Saturday (c) Thursday (d) Wednesday
  24. 24.14 × 4 =
  25. 25.Take 980. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  26. 26.1 + 2 + 3 + … + 30 =
  27. 27.464? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.6?03 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.9 × 8 =
  30. 30.403 × ? = 4030
  31. 31.29 × 1000 =
  32. 32.Magic square (every row, column and diagonal has the same total): 6 ? 8 | 11 9 7 | 10 5 12. What is the missing number?
  33. 33.12 × 4 =
  34. 34.I thought of a number, multiplied it by 2 and added 3. I got 29. What was my number?
  35. 35.Do the 1089 trick with 980: reverse and subtract, then reverse that answer and add. What do you get?
  36. 36.Magic square (every row, column and diagonal has the same total): 6 16 14 | 20 12 4 | 10 8 ?. What is the missing number?
  37. 37.45 × 4 =
  38. 38.3 × 9 =
  39. 39.38 × 4 =
  40. 40.If today is Tuesday, what day will it be after 80 days? (a) Friday (b) Monday (c) Thursday (d) Saturday

Answer key

  1. 220
  2. 4465
  3. 6
  4. 3
  5. 6700
  6. 18
  7. 8
  8. 256
  9. Wednesday
  10. 27
  11. 140
  12. Friday
  13. 31
  14. 49
  15. 12321
  16. 44
  17. 2
  18. 13
  19. Tuesday
  20. 121
  21. 36
  22. 1089
  23. Wednesday
  24. 56
  25. 891
  26. 465
  27. 4
  28. 9
  29. 72
  30. 10
  31. 29000
  32. 13
  33. 48
  34. 13
  35. 1089
  36. 18
  37. 180
  38. 27
  39. 152
  40. Friday

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