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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 748 · 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. 1.11111 × 11111 =
  2. 2.40 × 4 =
  3. 3.1 + 2 + 3 + … + 42 =
  4. 4.495 + 594 =
  5. 5.I thought of a number, added 1 and then doubled it. I got 42. What was my number?
  6. 6.Magic square (every row, column and diagonal has the same total): 10 17 12 | ? 13 11 | 14 9 16. What is the missing number?
  7. 7.297 + 792 =
  8. 8.8 × 9 =
  9. 9.A girl is 11 years old and her brother is 2 years older. How old will her brother be in 2 years?
  10. 10.47 × 4 =
  11. 11.9 × 10 = 9? — what is the missing digit?
  12. 12.12345679 × 9 =
  13. 13.14 × 1000 =
  14. 14.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  15. 15.1 + 2 + 3 + … + 86 =
  16. 16.If today is Monday, what day was it 19 days ago? (a) Saturday (b) Wednesday (c) Tuesday (d) Thursday
  17. 17.9 × 3 = ?7 — what is the missing digit?
  18. 18.52 × 4 =
  19. 19.1111 × 1111 =
  20. 20.In 5 years a boy will be 18 years old. How old was he 6 years ago?
  21. 21.17 × ? = 17000
  22. 22.Half of 48 =
  23. 23.I thought of a number, multiplied it by 3 and added 4. I got 40. What was my number?
  24. 24.213 × 10 =
  25. 25.9 × 7 =
  26. 26.9 × 3 =
  27. 27.9 × 5 =
  28. 28.What comes next? 2, 4, 8, 16, ? (a) 28 (b) 33 (c) 24 (d) 32
  29. 29.If today is Thursday, what day was it 22 days ago? (a) Saturday (b) Thursday (c) Tuesday (d) Wednesday
  30. 30.Take 922. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  31. 31.12 × 9 + 3 =
  32. 32.9 × 2 = 1? — what is the missing digit?
  33. 33.48 × 4 =
  34. 34.1 + 2 + 3 + … + 23 =
  35. 35.9 × 10 =
  36. 36.9 × 2 =
  37. 37.6 × 4 =
  38. 38.37 × 6 =
  39. 39.The 6th of a month is a Saturday. What day is the 22nd of the same month? (a) Sunday (b) Tuesday (c) Monday (d) Thursday
  40. 40.1 + 2 + 3 + … + 76 =

Answer key

  1. 123454321
  2. 160
  3. 903
  4. 1089
  5. 20
  6. 15
  7. 1089
  8. 72
  9. 15
  10. 188
  11. 0
  12. 111111111
  13. 14000
  14. 297
  15. 3741
  16. Wednesday
  17. 2
  18. 208
  19. 1234321
  20. 7
  21. 1000
  22. 24
  23. 12
  24. 2130
  25. 63
  26. 27
  27. 45
  28. 32
  29. Wednesday
  30. 693
  31. 111
  32. 8
  33. 192
  34. 276
  35. 90
  36. 18
  37. 24
  38. 222
  39. Monday
  40. 2926

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