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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 945 · 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. 1.891 + 198 =
  2. 2.968 × ? = 9680
  3. 3.9 × 2 = ?8 — what is the missing digit?
  4. 4.1234 × 9 + 5 =
  5. 5.I thought of a number, added 3 and then doubled it. I got 46. What was my number?
  6. 6.9 × 5 = 4? — what is the missing digit?
  7. 7.A girl is 10 years old and her brother is 2 years older. How old will her brother be in 6 years?
  8. 8.32 × 100 =
  9. 9.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
  10. 10.Half of 84 =
  11. 11.A girl is 7 years old and her brother is 4 years older. How old will her brother be in 6 years?
  12. 12.23 × 1000 =
  13. 13.105? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.50 × 4 =
  15. 15.What comes next? 9, 16, 25, 36, ? (a) 49 (b) 47 (c) 50 (d) 51
  16. 16.7 × 9 =
  17. 17.813 × 10 =
  18. 18.1 + 2 + 3 + … + 36 =
  19. 19.In 2 years a boy will be 12 years old. How old was he 7 years ago?
  20. 20.2 × 9 =
  21. 21.Take 97 and take away the sum of its digits. What do you get?
  22. 22.Magic trick! Think of 17. Double it, add 10, halve it, then take away 17. What number do you get?
  23. 23.27 × ? = 27000
  24. 24.Half of 142 =
  25. 25.9 × 9 =
  26. 26.If today is Monday, what day will it be after 31 days? (a) Wednesday (b) Thursday (c) Friday (d) Sunday
  27. 27.A girl is 7 years old and her brother is 6 years older. How old will her brother be in 4 years?
  28. 28.9 × 9 = ?1 — what is the missing digit?
  29. 29.What comes next? 1, 3, 5, 7, ? (a) 7 (b) 10 (c) 9 (d) 11
  30. 30.If today is Tuesday, what day was it 26 days ago? (a) Wednesday (b) Thursday (c) Sunday (d) Friday
  31. 31.Magic square (every row, column and diagonal has the same total): 11 10 15 | 16 12 8 | ? 14 13. What is the missing number?
  32. 32.Magic square (every row, column and diagonal has the same total): ? 12 7 | 6 10 14 | 13 8 9. What is the missing number?
  33. 33.12345679 × 36 =
  34. 34.198 + 891 =
  35. 35.Half of 42 =
  36. 36.Take 39 and take away the sum of its digits. What do you get?
  37. 37.Double 88 =
  38. 38.What comes next? 15, 18, 21, 24, ? (a) 24 (b) 28 (c) 27 (d) 30
  39. 39.What comes next? 3, 6, 12, 24, ? (a) 48 (b) 36 (c) 42 (d) 49
  40. 40.1 + 3 + 5 + … + 41 =

Answer key

  1. 1089
  2. 10
  3. 1
  4. 11111
  5. 20
  6. 5
  7. 18
  8. 3200
  9. 495
  10. 42
  11. 17
  12. 23000
  13. 3
  14. 200
  15. 49
  16. 63
  17. 8130
  18. 666
  19. 3
  20. 18
  21. 81
  22. 5
  23. 1000
  24. 71
  25. 81
  26. Thursday
  27. 17
  28. 8
  29. 9
  30. Thursday
  31. 9
  32. 11
  33. 444444444
  34. 1089
  35. 21
  36. 27
  37. 176
  38. 27
  39. 48
  40. 441

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