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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 31 · 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.In 3 years a boy will be 16 years old. How old was he 5 years ago?
  2. 2.792 + 297 =
  3. 3.Double 29 =
  4. 4.12 × 9 + 3 =
  5. 5.86 × ? = 8600
  6. 6.37 × 24 =
  7. 7.Double 32 =
  8. 8.1 + 3 + 5 + … + 27 =
  9. 9.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
  10. 10.A girl is 8 years old and her brother is 4 years older. How old will her brother be in 9 years?
  11. 11.Magic square (every row, column and diagonal has the same total): 27 12 15 | 6 18 ? | 21 24 9. What is the missing number?
  12. 12.Do the 1089 trick with 631: reverse and subtract, then reverse that answer and add. What do you get?
  13. 13.If today is Sunday, what day will it be after 19 days? (a) Friday (b) Saturday (c) Monday (d) Thursday
  14. 14.9 × 5 = ?5 — what is the missing digit?
  15. 15.198 + 891 =
  16. 16.9 × 7 = ?3 — what is the missing digit?
  17. 17.Odd one out: which number is NOT in the 8 times table? (a) 48 (b) 71 (c) 16 (d) 24
  18. 18.2 × 9 =
  19. 19.61 × 100 =
  20. 20.32 × 4 =
  21. 21.89 × 100 =
  22. 22.9 × 6 = 5? — what is the missing digit?
  23. 23.The 2nd of a month is a Monday. What day is the 24th of the same month? (a) Tuesday (b) Wednesday (c) Friday (d) Monday
  24. 24.The ages of two twins add up to 12. How old is each twin?
  25. 25.9 × 10 = ?0 — what is the missing digit?
  26. 26.11 × 11 =
  27. 27.1 + 2 + 3 + … + 21 =
  28. 28.A girl is 11 years old and her brother is 3 years older. How old will her brother be in 3 years?
  29. 29.Take 299. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  30. 30.What comes next? 13, 19, 25, 31, ? (a) 31 (b) 37 (c) 43 (d) 38
  31. 31.1 + 2 + 3 + … + 31 =
  32. 32.Half of 144 =
  33. 33.12345679 × 18 =
  34. 34.A father is 31 years old and his son is 5. How old was the father when the son was born?
  35. 35.If today is Thursday, what day was it 38 days ago? (a) Thursday (b) Sunday (c) Tuesday (d) Monday
  36. 36.A father is 43 years old and his son is 7. How old was the father when the son was born?
  37. 37.Magic square (every row, column and diagonal has the same total): 4 18 8 | 14 10 6 | ? 2 16. What is the missing number?
  38. 38.1 + 3 + 5 + … + 19 =
  39. 39.If today is Monday, what day will it be after 52 days? (a) Thursday (b) Friday (c) Sunday (d) Wednesday
  40. 40.Take 46 and take away the sum of its digits. What do you get?

Answer key

  1. 8
  2. 1089
  3. 58
  4. 111
  5. 100
  6. 888
  7. 64
  8. 196
  9. 396
  10. 21
  11. 30
  12. 1089
  13. Friday
  14. 4
  15. 1089
  16. 6
  17. 71
  18. 18
  19. 6100
  20. 128
  21. 8900
  22. 4
  23. Tuesday
  24. 6
  25. 9
  26. 121
  27. 231
  28. 17
  29. 693
  30. 37
  31. 496
  32. 72
  33. 222222222
  34. 26
  35. Monday
  36. 36
  37. 12
  38. 100
  39. Thursday
  40. 36

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