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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 559 · 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. 1.854? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.Magic square (every row, column and diagonal has the same total): 12 26 16 | 22 18 14 | ? 10 24. What is the missing number?
  3. 3.37 × 21 =
  4. 4.A girl is 6 years old and her brother is 3 years older. How old will her brother be in 7 years?
  5. 5.?074 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.Do the 1089 trick with 941: reverse and subtract, then reverse that answer and add. What do you get?
  7. 7.31 × 4 =
  8. 8.Magic square (every row, column and diagonal has the same total): 8 9 4 | 3 7 ? | 10 5 6. What is the missing number?
  9. 9.Magic square (every row, column and diagonal has the same total): 7 12 11 | 14 10 6 | 9 ? 13. What is the missing number?
  10. 10.1 + 2 + 3 + … + 19 =
  11. 11.1 + 2 + 3 + … + 39 =
  12. 12.If today is Tuesday, what day will it be after 48 days? (a) Monday (b) Sunday (c) Thursday (d) Tuesday
  13. 13.The 2nd of a month is a Friday. What day is the 24th of the same month? (a) Tuesday (b) Friday (c) Saturday (d) Sunday
  14. 14.Double 85 =
  15. 15.10 × ? = 10000
  16. 16.If today is Monday, what day will it be after 35 days? (a) Sunday (b) Tuesday (c) Monday (d) Thursday
  17. 17.5 × 9 =
  18. 18.12 × 1000 =
  19. 19.What comes next? 4, 8, 16, 32, ? (a) 48 (b) 64 (c) 65 (d) 56
  20. 20.55 × 4 =
  21. 21.1111 × 1111 =
  22. 22.You have 15 coins. Each coin is ₹1 or ₹2, and together they make ₹23. How many ₹2 coins do you have?
  23. 23.Magic square (every row, column and diagonal has the same total): 3 10 5 | ? 6 4 | 7 2 9. What is the missing number?
  24. 24.1 + 2 + 3 + … + 95 =
  25. 25.The 7th of a month is a Wednesday. What day is the 22nd of the same month? (a) Friday (b) Sunday (c) Thursday (d) Wednesday
  26. 26.Double 35 =
  27. 27.52 × 100 =
  28. 28.You have 5 coins. Each coin is ₹1 or ₹2, and together they make ₹9. How many ₹2 coins do you have?
  29. 29.4 × 9 =
  30. 30.Do the 1089 trick with 449: reverse and subtract, then reverse that answer and add. What do you get?
  31. 31.9 × 8 = 7? — what is the missing digit?
  32. 32.9 × 5 = ?5 — what is the missing digit?
  33. 33.9 × 5 = 4? — what is the missing digit?
  34. 34.Magic trick! Think of 20. Double it, add 8, halve it, then take away 20. What number do you get?
  35. 35.1 + 3 + 5 + … + 13 =
  36. 36.I thought of a number, multiplied it by 5 and added 6. I got 46. What was my number?
  37. 37.Magic trick! Think of 15. Double it, add 8, halve it, then take away 15. What number do you get?
  38. 38.The 7th of a month is a Friday. What day is the 23rd of the same month? (a) Saturday (b) Wednesday (c) Sunday (d) Monday
  39. 39.Do the 1089 trick with 199: reverse and subtract, then reverse that answer and add. What do you get?
  40. 40.106 × 10 =

Answer key

  1. 1
  2. 20
  3. 777
  4. 16
  5. 7
  6. 1089
  7. 124
  8. 11
  9. 8
  10. 190
  11. 780
  12. Monday
  13. Saturday
  14. 170
  15. 1000
  16. Monday
  17. 45
  18. 12000
  19. 64
  20. 220
  21. 1234321
  22. 8
  23. 8
  24. 4560
  25. Thursday
  26. 70
  27. 5200
  28. 4
  29. 36
  30. 1089
  31. 2
  32. 4
  33. 5
  34. 4
  35. 49
  36. 8
  37. 4
  38. Sunday
  39. 1089
  40. 1060

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