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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 225 · 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 × 3 = ?7 — what is the missing digit?
  2. 2.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  3. 3.Magic square (every row, column and diagonal has the same total): 3 10 ? | 8 6 4 | 7 2 9. What is the missing number?
  4. 4.Take 32 and take away the sum of its digits. What do you get?
  5. 5.37 × 9 =
  6. 6.Think of 12. Multiply it by 5, then add 8. What number do you end with?
  7. 7.9 × 8 = ?2 — what is the missing digit?
  8. 8.You have 7 coins. Each coin is ₹1 or ₹2, and together they make ₹10. How many ₹2 coins do you have?
  9. 9.7 × 9 =
  10. 10.111 × 111 =
  11. 11.A father is 34 years old and his son is 14. How old was the father when the son was born?
  12. 12.Half of 106 =
  13. 13.Double 23 =
  14. 14.In 5 years a boy will be 13 years old. How old was he 2 years ago?
  15. 15.The ages of two twins add up to 8. How old is each twin?
  16. 16.The 3rd of a month is a Monday. What day is the 23rd of the same month? (a) Saturday (b) Monday (c) Sunday (d) Wednesday
  17. 17.907 × ? = 9070
  18. 18.17 × 4 =
  19. 19.4?46 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.If today is Friday, what day will it be after 92 days? (a) Friday (b) Saturday (c) Tuesday (d) Sunday
  21. 21.I thought of a number, multiplied it by 5 and added 2. I got 22. What was my number?
  22. 22.9 × 6 = ?4 — what is the missing digit?
  23. 23.A girl is 8 years old and her brother is 4 years older. How old will her brother be in 7 years?
  24. 24.31 × 4 =
  25. 25.32 × 4 =
  26. 26.1 + 3 + 5 + … + 13 =
  27. 27.If today is Saturday, what day was it 58 days ago? (a) Sunday (b) Friday (c) Thursday (d) Wednesday
  28. 28.1 + 2 + 3 + … + 10 =
  29. 29.Half of 178 =
  30. 30.The 4th of a month is a Sunday. What day is the 25th of the same month? (a) Sunday (b) Monday (c) Saturday (d) Wednesday
  31. 31.1 + 2 + 3 + … + 63 =
  32. 32.37 × 6 =
  33. 33.792 + 297 =
  34. 34.If today is Wednesday, what day will it be after 27 days? (a) Tuesday (b) Friday (c) Wednesday (d) Monday
  35. 35.If today is Sunday, what day was it 29 days ago? (a) Tuesday (b) Friday (c) Saturday (d) Sunday
  36. 36.Magic trick! Think of 16. Double it, add 8, halve it, then take away 16. What number do you get?
  37. 37.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
  38. 38.What comes next? 16, 25, 36, 49, ? (a) 65 (b) 62 (c) 66 (d) 64
  39. 39.23 × 4 =
  40. 40.If today is Saturday, what day was it 28 days ago? (a) Sunday (b) Tuesday (c) Friday (d) Saturday

Answer key

  1. 2
  2. 297
  3. 5
  4. 27
  5. 333
  6. 68
  7. 7
  8. 3
  9. 63
  10. 12321
  11. 20
  12. 53
  13. 46
  14. 6
  15. 4
  16. Sunday
  17. 10
  18. 68
  19. 4
  20. Saturday
  21. 4
  22. 5
  23. 19
  24. 124
  25. 128
  26. 49
  27. Thursday
  28. 55
  29. 89
  30. Sunday
  31. 2016
  32. 222
  33. 1089
  34. Tuesday
  35. Saturday
  36. 4
  37. 495
  38. 64
  39. 92
  40. Saturday

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