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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 406 · 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. 1.12345678 × 8 + 8 =
  2. 2.991 × ? = 9910
  3. 3.8?02 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.5 × 9 =
  5. 5.17 × 100 =
  6. 6.1 + 2 + 3 + … + 42 =
  7. 7.41 × 4 =
  8. 8.Double 15 =
  9. 9.Magic square (every row, column and diagonal has the same total): 12 ? 24 | 33 21 9 | 18 15 30. What is the missing number?
  10. 10.9 × 9 = ?1 — what is the missing digit?
  11. 11.9 × 10 = ?0 — what is the missing digit?
  12. 12.9 × 4 = ?6 — what is the missing digit?
  13. 13.Take 941. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  14. 14.Half of 116 =
  15. 15.31 × 4 =
  16. 16.A girl is 10 years old and her brother is 5 years older. How old will her brother be in 2 years?
  17. 17.In 4 years a boy will be 15 years old. How old was he 4 years ago?
  18. 18.258? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.?879 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.12345679 × 54 =
  21. 21.I thought of a number, multiplied it by 3 and added 4. I got 40. What was my number?
  22. 22.The 5th of a month is a Tuesday. What day is the 13th of the same month? (a) Saturday (b) Thursday (c) Wednesday (d) Tuesday
  23. 23.If today is Saturday, what day will it be after 54 days? (a) Sunday (b) Thursday (c) Friday (d) Wednesday
  24. 24.Magic square (every row, column and diagonal has the same total): 18 21 6 | 3 15 27 | ? 9 12. What is the missing number?
  25. 25.Magic trick! Think of 15. Double it, add 8, halve it, then take away 15. What number do you get?
  26. 26.You have 5 coins. Each coin is ₹1 or ₹2, and together they make ₹8. How many ₹2 coins do you have?
  27. 27.The 8th of a month is a Friday. What day is the 30th of the same month? (a) Tuesday (b) Sunday (c) Friday (d) Saturday
  28. 28.32 × ? = 3200
  29. 29.23 × 4 =
  30. 30.12345679 × 72 =
  31. 31.If today is Monday, what day will it be after 87 days? (a) Thursday (b) Sunday (c) Wednesday (d) Friday
  32. 32.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  33. 33.9 × 3 = ?7 — what is the missing digit?
  34. 34.You have 9 coins. Each coin is ₹1 or ₹2, and together they make ₹13. How many ₹2 coins do you have?
  35. 35.50 × 4 =
  36. 36.22 × 4 =
  37. 37.786? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.A father is 32 years old and his son is 12. How old was the father when the son was born?
  39. 39.2 × 9 =
  40. 40.29 × 4 =

Answer key

  1. 98765432
  2. 10
  3. 8
  4. 45
  5. 1700
  6. 903
  7. 164
  8. 30
  9. 27
  10. 8
  11. 9
  12. 3
  13. 792
  14. 58
  15. 124
  16. 17
  17. 7
  18. 3
  19. 3
  20. 666666666
  21. 12
  22. Wednesday
  23. Thursday
  24. 24
  25. 4
  26. 3
  27. Saturday
  28. 100
  29. 92
  30. 888888888
  31. Thursday
  32. 693
  33. 2
  34. 4
  35. 200
  36. 88
  37. 6
  38. 20
  39. 18
  40. 116

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