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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 422 · 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. 1.792 + 297 =
  2. 2.9 × 7 = ?3 — what is the missing digit?
  3. 3.111111 × 111111 =
  4. 4.15 × ? = 1500
  5. 5.Double 94 =
  6. 6.9 × 4 =
  7. 7.The ages of two twins add up to 18. How old is each twin?
  8. 8.Half of 72 =
  9. 9.22 × 4 =
  10. 10.Double 19 =
  11. 11.Double 37 =
  12. 12.32 × 4 =
  13. 13.29 × 4 =
  14. 14.I thought of a number, added 8 and then doubled it. I got 38. What was my number?
  15. 15.25 × 100 =
  16. 16.Magic square (every row, column and diagonal has the same total): 21 ? 27 | 24 18 12 | 9 30 15. What is the missing number?
  17. 17.A girl is 5 years old and her brother is 4 years older. How old will her brother be in 4 years?
  18. 18.8 × 9 =
  19. 19.4 × 9 =
  20. 20.11111 × 11111 =
  21. 21.9 × 4 = ?6 — what is the missing digit?
  22. 22.?646 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.7 × 4 =
  24. 24.1 + 2 + 3 + … + 36 =
  25. 25.If today is Saturday, what day will it be after 21 days? (a) Sunday (b) Friday (c) Saturday (d) Tuesday
  26. 26.Do the 1089 trick with 452: reverse and subtract, then reverse that answer and add. What do you get?
  27. 27.1 + 2 + 3 + … + 62 =
  28. 28.I thought of a number, multiplied it by 5 and added 4. I got 24. What was my number?
  29. 29.1 + 3 + 5 + … + 13 =
  30. 30.If today is Friday, what day was it 29 days ago? (a) Thursday (b) Friday (c) Sunday (d) Wednesday
  31. 31.What comes next? 3, 10, 17, 24, ? (a) 32 (b) 38 (c) 31 (d) 24
  32. 32.8?79 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.1 + 3 + 5 + … + 15 =
  34. 34.9 × 6 =
  35. 35.The ages of two twins add up to 12. How old is each twin?
  36. 36.37 × 3 =
  37. 37.9 × 6 = 5? — what is the missing digit?
  38. 38.If today is Sunday, what day will it be after 37 days? (a) Monday (b) Friday (c) Wednesday (d) Tuesday
  39. 39.1 + 2 + 3 + … + 48 =
  40. 40.9 × 6 = ?4 — what is the missing digit?

Answer key

  1. 1089
  2. 6
  3. 12345654321
  4. 100
  5. 188
  6. 36
  7. 9
  8. 36
  9. 88
  10. 38
  11. 74
  12. 128
  13. 116
  14. 11
  15. 2500
  16. 6
  17. 13
  18. 72
  19. 36
  20. 123454321
  21. 3
  22. 2
  23. 28
  24. 666
  25. Saturday
  26. 1089
  27. 1953
  28. 4
  29. 49
  30. Thursday
  31. 31
  32. 3
  33. 64
  34. 54
  35. 6
  36. 111
  37. 4
  38. Tuesday
  39. 1176
  40. 5

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