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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 384 · 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.What comes next? 20, 22, 24, 26, ? (a) 29 (b) 26 (c) 28 (d) 30
  2. 2.12345679 × 9 =
  3. 3.What comes next? 1, 2, 4, 8, ? (a) 17 (b) 12 (c) 16 (d) 14
  4. 4.9 × 2 = ?8 — what is the missing digit?
  5. 5.A girl is 6 years old and her brother is 6 years older. How old will her brother be in 7 years?
  6. 6.111111 × 111111 =
  7. 7.Magic square (every row, column and diagonal has the same total): 12 14 4 | 2 ? 18 | 16 6 8. What is the missing number?
  8. 8.9 × 2 = 1? — what is the missing digit?
  9. 9.9 × 3 = ?7 — what is the missing digit?
  10. 10.A father is 35 years old and his son is 11. How old was the father when the son was born?
  11. 11.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
  12. 12.If today is Saturday, what day will it be after 61 days? (a) Wednesday (b) Sunday (c) Thursday (d) Friday
  13. 13.If today is Thursday, what day will it be after 85 days? (a) Friday (b) Saturday (c) Thursday (d) Monday
  14. 14.Odd one out: which number is NOT in the 9 times table? (a) 63 (b) 36 (c) 54 (d) 75
  15. 15.Magic trick! Think of 13. Double it, add 6, halve it, then take away 13. What number do you get?
  16. 16.Magic square (every row, column and diagonal has the same total): 14 15 10 | 9 13 17 | 16 ? 12. What is the missing number?
  17. 17.Think of 4. Multiply it by 3, then add 5. What number do you end with?
  18. 18.12345679 × 54 =
  19. 19.891 + 198 =
  20. 20.You have 12 coins. Each coin is ₹1 or ₹2, and together they make ₹19. How many ₹2 coins do you have?
  21. 21.9 × 4 =
  22. 22.?726 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 20 and take away the sum of its digits. What do you get?
  24. 24.Do the 1089 trick with 951: reverse and subtract, then reverse that answer and add. What do you get?
  25. 25.37 × 4 =
  26. 26.If today is Tuesday, what day will it be after 37 days? (a) Wednesday (b) Thursday (c) Friday (d) Sunday
  27. 27.9 × 6 = ?4 — what is the missing digit?
  28. 28.37 × 3 =
  29. 29.Take 37 and take away the sum of its digits. What do you get?
  30. 30.What comes next? 13, 22, 31, 40, ? (a) 58 (b) 49 (c) 50 (d) 40
  31. 31.Double 11 =
  32. 32.1 + 2 + 3 + … + 77 =
  33. 33.27 × 4 =
  34. 34.If today is Thursday, what day was it 29 days ago? (a) Thursday (b) Tuesday (c) Saturday (d) Wednesday
  35. 35.Double 28 =
  36. 36.12345678 × 9 + 9 =
  37. 37.?885 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.Double 31 =
  39. 39.What comes next? 4, 8, 16, 32, ? (a) 56 (b) 64 (c) 65 (d) 48
  40. 40.9 × 2 =

Answer key

  1. 28
  2. 111111111
  3. 16
  4. 1
  5. 19
  6. 12345654321
  7. 10
  8. 8
  9. 2
  10. 24
  11. 495
  12. Thursday
  13. Friday
  14. 75
  15. 3
  16. 11
  17. 17
  18. 666666666
  19. 1089
  20. 7
  21. 36
  22. 3
  23. 18
  24. 1089
  25. 148
  26. Thursday
  27. 5
  28. 111
  29. 27
  30. 49
  31. 22
  32. 3003
  33. 108
  34. Wednesday
  35. 56
  36. 111111111
  37. 6
  38. 62
  39. 64
  40. 18

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