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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 704 · 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.Half of 88 =
  2. 2.9 × 1 =
  3. 3.9 × 2 = ?8 — what is the missing digit?
  4. 4.3 × 9 =
  5. 5.37 × 6 =
  6. 6.The 8th of a month is a Monday. What day is the 25th of the same month? (a) Thursday (b) Friday (c) Sunday (d) Wednesday
  7. 7.495 + 594 =
  8. 8.4 × 1000 =
  9. 9.48 × ? = 4800
  10. 10.A girl is 8 years old and her brother is 3 years older. How old will her brother be in 6 years?
  11. 11.I thought of a number, added 4 and then doubled it. I got 16. What was my number?
  12. 12.7 × 1000 =
  13. 13.6 × 1000 =
  14. 14.A father is 33 years old and his son is 14. How old was the father when the son was born?
  15. 15.In 4 years a boy will be 17 years old. How old was he 6 years ago?
  16. 16.9 × 2 = 1? — what is the missing digit?
  17. 17.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  18. 18.Double 52 =
  19. 19.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
  20. 20.9 × 3 = ?7 — what is the missing digit?
  21. 21.Half of 162 =
  22. 22.9 × 4 = ?6 — what is the missing digit?
  23. 23.What comes next? 36, 49, 64, 81, ? (a) 100 (b) 101 (c) 102 (d) 98
  24. 24.16 × 4 =
  25. 25.Double 19 =
  26. 26.If today is Wednesday, what day was it 39 days ago? (a) Friday (b) Saturday (c) Tuesday (d) Sunday
  27. 27.Double 55 =
  28. 28.Magic square (every row, column and diagonal has the same total): 14 29 26 | 35 23 11 | 20 ? 32. What is the missing number?
  29. 29.9 × 8 = ?2 — what is the missing digit?
  30. 30.?016 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.637 × ? = 6370
  32. 32.If today is Tuesday, what day will it be after 79 days? (a) Friday (b) Wednesday (c) Thursday (d) Sunday
  33. 33.Take 26 and take away the sum of its digits. What do you get?
  34. 34.1 + 3 + 5 + … + 45 =
  35. 35.9 × 9 = 8? — what is the missing digit?
  36. 36.32 × 4 =
  37. 37.Magic trick! Think of 19. Double it, add 10, halve it, then take away 19. What number do you get?
  38. 38.9 × 6 = ?4 — what is the missing digit?
  39. 39.Double 84 =
  40. 40.40 × 1000 =

Answer key

  1. 44
  2. 9
  3. 1
  4. 27
  5. 222
  6. Thursday
  7. 1089
  8. 4000
  9. 100
  10. 17
  11. 4
  12. 7000
  13. 6000
  14. 19
  15. 7
  16. 8
  17. 693
  18. 104
  19. 198
  20. 2
  21. 81
  22. 3
  23. 100
  24. 64
  25. 38
  26. Saturday
  27. 110
  28. 17
  29. 7
  30. 2
  31. 10
  32. Thursday
  33. 18
  34. 529
  35. 1
  36. 128
  37. 5
  38. 5
  39. 168
  40. 40000

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