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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 331 · 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 × 6 = 5? — what is the missing digit?
  2. 2.If today is Monday, what day was it 57 days ago? (a) Wednesday (b) Sunday (c) Monday (d) Saturday
  3. 3.9 × 2 = ?8 — what is the missing digit?
  4. 4.9 × 6 = ?4 — what is the missing digit?
  5. 5.1 + 3 + 5 + … + 11 =
  6. 6.9 × 8 = ?2 — what is the missing digit?
  7. 7.Take 227. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  8. 8.300 × ? = 3000
  9. 9.93 × ? = 9300
  10. 10.What comes next? 3, 6, 12, 24, ? (a) 36 (b) 48 (c) 42 (d) 49
  11. 11.9 × 2 = 1? — what is the missing digit?
  12. 12.?854 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.I thought of a number, multiplied it by 3 and added 4. I got 16. What was my number?
  14. 14.8 × 4 =
  15. 15.If today is Sunday, what day will it be after 34 days? (a) Tuesday (b) Sunday (c) Friday (d) Saturday
  16. 16.6?67 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.10 × 1000 =
  18. 18.You have 12 coins. Each coin is ₹1 or ₹2, and together they make ₹13. How many ₹2 coins do you have?
  19. 19.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
  20. 20.If today is Friday, what day was it 28 days ago? (a) Monday (b) Saturday (c) Friday (d) Thursday
  21. 21.Double 74 =
  22. 22.1 + 2 + 3 + … + 93 =
  23. 23.I thought of a number, multiplied it by 2 and added 2. I got 20. What was my number?
  24. 24.If today is Thursday, what day will it be after 85 days? (a) Thursday (b) Saturday (c) Friday (d) Monday
  25. 25.8 × 1000 =
  26. 26.9 × 7 = 6? — what is the missing digit?
  27. 27.27 × 4 =
  28. 28.Double 91 =
  29. 29.The 4th of a month is a Tuesday. What day is the 17th of the same month? (a) Monday (b) Thursday (c) Tuesday (d) Sunday
  30. 30.Magic square (every row, column and diagonal has the same total): 8 18 ? | 22 14 6 | 12 10 20. What is the missing number?
  31. 31.9 × 5 = ?5 — what is the missing digit?
  32. 32.9 × 2 =
  33. 33.Half of 82 =
  34. 34.Half of 42 =
  35. 35.693 + 396 =
  36. 36.If today is Sunday, what day will it be after 31 days? (a) Saturday (b) Tuesday (c) Thursday (d) Wednesday
  37. 37.The ages of two twins add up to 14. How old is each twin?
  38. 38.62 × 100 =
  39. 39.9 × 3 = ?7 — what is the missing digit?
  40. 40.17 × 4 =

Answer key

  1. 4
  2. Sunday
  3. 1
  4. 5
  5. 36
  6. 7
  7. 495
  8. 10
  9. 100
  10. 48
  11. 8
  12. 1
  13. 4
  14. 32
  15. Saturday
  16. 8
  17. 10000
  18. 1
  19. 495
  20. Friday
  21. 148
  22. 4371
  23. 9
  24. Friday
  25. 8000
  26. 3
  27. 108
  28. 182
  29. Monday
  30. 16
  31. 4
  32. 18
  33. 41
  34. 21
  35. 1089
  36. Wednesday
  37. 7
  38. 6200
  39. 2
  40. 68

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