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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 189 · 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 × 3 = ?7 — what is the missing digit?
  2. 2.26 × 4 =
  3. 3.1 + 2 + 3 + … + 73 =
  4. 4.A father is 35 years old and his son is 5. How old was the father when the son was born?
  5. 5.9 × 5 = ?5 — what is the missing digit?
  6. 6.10 × 9 =
  7. 7.You have 14 coins. Each coin is ₹1 or ₹2, and together they make ₹26. How many ₹2 coins do you have?
  8. 8.Magic square (every row, column and diagonal has the same total): 24 27 12 | 9 21 33 | 30 15 ?. What is the missing number?
  9. 9.Double 48 =
  10. 10.9 × 7 =
  11. 11.37 × 12 =
  12. 12.What comes next? 4, 8, 12, 16, ? (a) 21 (b) 20 (c) 16 (d) 24
  13. 13.A piggy bank has 7 coins of ₹5 and 5 coins of ₹2. How many rupees are in it?
  14. 14.Magic square (every row, column and diagonal has the same total): 17 32 ? | 14 20 26 | 29 8 23. What is the missing number?
  15. 15.1 + 3 + 5 + … + 13 =
  16. 16.16 × 4 =
  17. 17.The 2nd of a month is a Monday. What day is the 23rd of the same month? (a) Monday (b) Tuesday (c) Sunday (d) Thursday
  18. 18.Magic trick! Think of 18. Double it, add 8, halve it, then take away 18. What number do you get?
  19. 19.1 × 9 =
  20. 20.If today is Wednesday, what day will it be after 53 days? (a) Wednesday (b) Sunday (c) Monday (d) Saturday
  21. 21.320 × 10 =
  22. 22.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
  23. 23.12345678 × 8 + 8 =
  24. 24.If today is Friday, what day was it 57 days ago? (a) Wednesday (b) Thursday (c) Sunday (d) Friday
  25. 25.What comes next? 25, 36, 49, 64, ? (a) 82 (b) 81 (c) 83 (d) 79
  26. 26.I thought of a number, added 1 and then doubled it. I got 30. What was my number?
  27. 27.9 × 10 = ?0 — what is the missing digit?
  28. 28.416 × 10 =
  29. 29.What comes next? 3, 6, 12, 24, ? (a) 36 (b) 49 (c) 42 (d) 48
  30. 30.1 + 3 + 5 + … + 31 =
  31. 31.Double 93 =
  32. 32.Do the 1089 trick with 930: reverse and subtract, then reverse that answer and add. What do you get?
  33. 33.?529 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.If today is Monday, what day will it be after 42 days? (a) Tuesday (b) Sunday (c) Monday (d) Thursday
  35. 35.Think of 9. Multiply it by 4, then add 5. What number do you end with?
  36. 36.Magic trick! Think of 20. Double it, add 8, halve it, then take away 20. What number do you get?
  37. 37.In 4 years a boy will be 18 years old. How old was he 7 years ago?
  38. 38.Magic square (every row, column and diagonal has the same total): 15 ? 13 | 10 12 14 | 11 16 9. What is the missing number?
  39. 39.If today is Friday, what day will it be after 90 days? (a) Thursday (b) Wednesday (c) Friday (d) Sunday
  40. 40.If today is Monday, what day will it be after 78 days? (a) Friday (b) Wednesday (c) Monday (d) Tuesday

Answer key

  1. 2
  2. 104
  3. 2701
  4. 30
  5. 4
  6. 90
  7. 12
  8. 18
  9. 96
  10. 63
  11. 444
  12. 20
  13. 45
  14. 11
  15. 49
  16. 64
  17. Monday
  18. 4
  19. 9
  20. Sunday
  21. 3200
  22. 792
  23. 98765432
  24. Thursday
  25. 81
  26. 14
  27. 9
  28. 4160
  29. 48
  30. 256
  31. 186
  32. 1089
  33. 2
  34. Monday
  35. 41
  36. 4
  37. 7
  38. 8
  39. Thursday
  40. Tuesday

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