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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 17 · 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. 1.1 × 9 =
  2. 2.35 × 1000 =
  3. 3.5?45 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.You have 14 coins. Each coin is ₹1 or ₹2, and together they make ₹27. How many ₹2 coins do you have?
  5. 5.Magic square (every row, column and diagonal has the same total): ? 3 17 | 15 11 7 | 5 19 9. What is the missing number?
  6. 6.I thought of a number, added 3 and then doubled it. I got 32. What was my number?
  7. 7.What comes next? 3, 6, 12, 24, ? (a) 36 (b) 42 (c) 48 (d) 49
  8. 8.12345679 × 9 =
  9. 9.Half of 34 =
  10. 10.In 5 years a boy will be 14 years old. How old was he 5 years ago?
  11. 11.12 × 9 + 3 =
  12. 12.9 × 10 =
  13. 13.?689 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.Magic trick! Think of 6. Double it, add 18, halve it, then take away 6. What number do you get?
  15. 15.24 × 4 =
  16. 16.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
  17. 17.59 × 4 =
  18. 18.9 × 10 = ?0 — what is the missing digit?
  19. 19.What comes next? 2, 4, 8, 16, ? (a) 33 (b) 32 (c) 28 (d) 24
  20. 20.If today is Sunday, what day will it be after 93 days? (a) Wednesday (b) Tuesday (c) Monday (d) Friday
  21. 21.Half of 102 =
  22. 22.9 × 10 = 9? — what is the missing digit?
  23. 23.9 × 9 =
  24. 24.If today is Monday, what day will it be after 95 days? (a) Thursday (b) Monday (c) Friday (d) Saturday
  25. 25.A piggy bank has 3 coins of ₹5 and 3 coins of ₹2. How many rupees are in it?
  26. 26.9 × 2 =
  27. 27.8?90 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.82?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Half of 174 =
  30. 30.If today is Sunday, what day will it be after 87 days? (a) Thursday (b) Wednesday (c) Tuesday (d) Saturday
  31. 31.17 × 100 =
  32. 32.In 6 years a boy will be 20 years old. How old was he 6 years ago?
  33. 33.Double 85 =
  34. 34.I thought of a number, multiplied it by 2 and added 7. I got 31. What was my number?
  35. 35.The ages of two twins add up to 22. How old is each twin?
  36. 36.8 × 9 =
  37. 37.12345679 × 54 =
  38. 38.9 × 2 = 1? — what is the missing digit?
  39. 39.27 × 4 =
  40. 40.What comes next? 4, 8, 16, 32, ? (a) 64 (b) 48 (c) 56 (d) 65

Answer key

  1. 9
  2. 35000
  3. 4
  4. 13
  5. 13
  6. 13
  7. 48
  8. 111111111
  9. 17
  10. 4
  11. 111
  12. 90
  13. 4
  14. 9
  15. 96
  16. 396
  17. 236
  18. 9
  19. 32
  20. Tuesday
  21. 51
  22. 0
  23. 81
  24. Friday
  25. 21
  26. 18
  27. 1
  28. 5
  29. 87
  30. Wednesday
  31. 1700
  32. 8
  33. 170
  34. 12
  35. 11
  36. 72
  37. 666666666
  38. 8
  39. 108
  40. 64

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