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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 582 · 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.What comes next? 5, 10, 20, 40, ? (a) 80 (b) 70 (c) 81 (d) 60
  2. 2.What comes next? 4, 8, 16, 32, ? (a) 48 (b) 56 (c) 64 (d) 65
  3. 3.Half of 138 =
  4. 4.If today is Wednesday, what day was it 52 days ago? (a) Sunday (b) Saturday (c) Wednesday (d) Monday
  5. 5.I thought of a number, added 1 and then doubled it. I got 16. What was my number?
  6. 6.Do the 1089 trick with 800: reverse and subtract, then reverse that answer and add. What do you get?
  7. 7.2 × 9 =
  8. 8.1 + 2 + 3 + … + 42 =
  9. 9.In 2 years a boy will be 13 years old. How old was he 4 years ago?
  10. 10.37 × 3 =
  11. 11.38 × 1000 =
  12. 12.9 × 3 =
  13. 13.Magic trick! Think of 10. Double it, add 18, halve it, then take away 10. What number do you get?
  14. 14.10 × 9 =
  15. 15.What comes next? 2, 4, 6, 8, ? (a) 11 (b) 8 (c) 10 (d) 12
  16. 16.9 × 10 = ?0 — what is the missing digit?
  17. 17.9 × 9 =
  18. 18.36 × 1000 =
  19. 19.11111 × 11111 =
  20. 20.123456 × 9 + 7 =
  21. 21.9 × 3 = 2? — what is the missing digit?
  22. 22.Double 43 =
  23. 23.Magic square (every row, column and diagonal has the same total): 7 8 3 | 2 6 10 | 9 ? 5. What is the missing number?
  24. 24.The 6th of a month is a Sunday. What day is the 17th of the same month? (a) Friday (b) Sunday (c) Wednesday (d) Thursday
  25. 25.123456 × 8 + 6 =
  26. 26.Take 731. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  27. 27.If today is Tuesday, what day will it be after 28 days? (a) Friday (b) Monday (c) Wednesday (d) Tuesday
  28. 28.20 × 4 =
  29. 29.396 + 693 =
  30. 30.Take 821. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  31. 31.719? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.12 × 9 + 3 =
  33. 33.37 × 27 =
  34. 34.What comes next? 36, 49, 64, 81, ? (a) 102 (b) 100 (c) 98 (d) 101
  35. 35.9 × 6 = 5? — what is the missing digit?
  36. 36.What comes next? 2, 4, 8, 16, ? (a) 24 (b) 28 (c) 32 (d) 33
  37. 37.1 + 3 + 5 + … + 27 =
  38. 38.In 2 years a boy will be 15 years old. How old was he 6 years ago?
  39. 39.The 3rd of a month is a Tuesday. What day is the 20th of the same month? (a) Monday (b) Thursday (c) Friday (d) Saturday
  40. 40.If today is Saturday, what day will it be after 11 days? (a) Wednesday (b) Tuesday (c) Thursday (d) Saturday

Answer key

  1. 80
  2. 64
  3. 69
  4. Sunday
  5. 7
  6. 1089
  7. 18
  8. 903
  9. 7
  10. 111
  11. 38000
  12. 27
  13. 9
  14. 90
  15. 10
  16. 9
  17. 81
  18. 36000
  19. 123454321
  20. 1111111
  21. 7
  22. 86
  23. 4
  24. Thursday
  25. 987654
  26. 594
  27. Tuesday
  28. 80
  29. 1089
  30. 693
  31. 1
  32. 111
  33. 999
  34. 100
  35. 4
  36. 32
  37. 196
  38. 7
  39. Friday
  40. Wednesday

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