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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 272 · 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.Magic trick! Think of 18. Double it, add 10, halve it, then take away 18. What number do you get?
  2. 2.36 × 1000 =
  3. 3.Magic trick! Think of 19. Double it, add 8, halve it, then take away 19. What number do you get?
  4. 4.392? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.If today is Thursday, what day will it be after 66 days? (a) Wednesday (b) Saturday (c) Monday (d) Sunday
  6. 6.I thought of a number, added 9 and then doubled it. I got 46. What was my number?
  7. 7.Magic square (every row, column and diagonal has the same total): 21 11 25 | 23 ? 15 | 13 27 17. What is the missing number?
  8. 8.The 2nd of a month is a Saturday. What day is the 19th of the same month? (a) Wednesday (b) Tuesday (c) Friday (d) Monday
  9. 9.Magic trick! Think of 2. Double it, add 4, halve it, then take away 2. What number do you get?
  10. 10.Think of 5. Multiply it by 2, then add 9. What number do you end with?
  11. 11.I thought of a number, added 3 and then doubled it. I got 36. What was my number?
  12. 12.You have 5 coins. Each coin is ₹1 or ₹2, and together they make ₹7. How many ₹2 coins do you have?
  13. 13.111111 × 111111 =
  14. 14.5 × 9 =
  15. 15.If today is Sunday, what day was it 18 days ago? (a) Tuesday (b) Wednesday (c) Thursday (d) Saturday
  16. 16.A girl is 5 years old and her brother is 5 years older. How old will her brother be in 8 years?
  17. 17.1234567 × 9 + 8 =
  18. 18.Do the 1089 trick with 982: reverse and subtract, then reverse that answer and add. What do you get?
  19. 19.Double 73 =
  20. 20.8 × 9 =
  21. 21.38 × 4 =
  22. 22.If today is Saturday, what day was it 32 days ago? (a) Monday (b) Tuesday (c) Wednesday (d) Friday
  23. 23.47 × 100 =
  24. 24.23 × 4 =
  25. 25.Take 311. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  26. 26.1 + 2 + 3 + … + 16 =
  27. 27.9 × 4 = ?6 — what is the missing digit?
  28. 28.9 × 9 =
  29. 29.A father is 41 years old and his son is 9. How old was the father when the son was born?
  30. 30.9 × 5 =
  31. 31.Magic square (every row, column and diagonal has the same total): ? 13 8 | 7 11 15 | 14 9 10. What is the missing number?
  32. 32.4 × 9 =
  33. 33.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
  34. 34.297 + 792 =
  35. 35.9 × 3 =
  36. 36.Take 690. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  37. 37.396 + 693 =
  38. 38.50 × 4 =
  39. 39.Magic square (every row, column and diagonal has the same total): 14 7 12 | 9 11 13 | 10 ? 8. What is the missing number?
  40. 40.9 × 7 = ?3 — what is the missing digit?

Answer key

  1. 5
  2. 36000
  3. 4
  4. 4
  5. Sunday
  6. 14
  7. 19
  8. Tuesday
  9. 2
  10. 19
  11. 15
  12. 2
  13. 12345654321
  14. 45
  15. Wednesday
  16. 18
  17. 11111111
  18. 1089
  19. 146
  20. 72
  21. 152
  22. Tuesday
  23. 4700
  24. 92
  25. 198
  26. 136
  27. 3
  28. 81
  29. 32
  30. 45
  31. 12
  32. 36
  33. 792
  34. 1089
  35. 27
  36. 594
  37. 1089
  38. 200
  39. 15
  40. 6

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