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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 213 · 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. 1.1 × 9 =
  2. 2.The ages of two twins add up to 14. How old is each twin?
  3. 3.11111 × 11111 =
  4. 4.A girl is 6 years old and her brother is 6 years older. How old will her brother be in 9 years?
  5. 5.If today is Friday, what day was it 23 days ago? (a) Thursday (b) Tuesday (c) Saturday (d) Wednesday
  6. 6.10 × 1000 =
  7. 7.396 + 693 =
  8. 8.Half of 142 =
  9. 9.41 × 4 =
  10. 10.Half of 62 =
  11. 11.Half of 192 =
  12. 12.What comes next? 2, 4, 8, 16, ? (a) 28 (b) 24 (c) 33 (d) 32
  13. 13.Do the 1089 trick with 188: reverse and subtract, then reverse that answer and add. What do you get?
  14. 14.1 + 2 + 3 + … + 32 =
  15. 15.Magic trick! Think of 16. Double it, add 12, halve it, then take away 16. What number do you get?
  16. 16.2 × 9 =
  17. 17.If today is Friday, what day was it 36 days ago? (a) Friday (b) Wednesday (c) Sunday (d) Thursday
  18. 18.A girl is 10 years old and her brother is 5 years older. How old will her brother be in 3 years?
  19. 19.1234 × 8 + 4 =
  20. 20.849? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.A girl is 6 years old and her brother is 2 years older. How old will her brother be in 4 years?
  22. 22.Magic square (every row, column and diagonal has the same total): 16 2 12 | 6 10 14 | ? 18 4. What is the missing number?
  23. 23.841 × ? = 8410
  24. 24.12345679 × 54 =
  25. 25.1 + 2 + 3 + … + 87 =
  26. 26.8 × ? = 8000
  27. 27.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
  28. 28.Double 26 =
  29. 29.Double 16 =
  30. 30.17 × 4 =
  31. 31.14 × 4 =
  32. 32.23 × 4 =
  33. 33.Double 22 =
  34. 34.Double 44 =
  35. 35.9 × 9 =
  36. 36.594 + 495 =
  37. 37.97 × 100 =
  38. 38.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
  39. 39.Double 28 =
  40. 40.1 + 2 + 3 + … + 8 =

Answer key

  1. 9
  2. 7
  3. 123454321
  4. 21
  5. Wednesday
  6. 10000
  7. 1089
  8. 71
  9. 164
  10. 31
  11. 96
  12. 32
  13. 1089
  14. 528
  15. 6
  16. 18
  17. Thursday
  18. 18
  19. 9876
  20. 6
  21. 12
  22. 8
  23. 10
  24. 666666666
  25. 3828
  26. 1000
  27. 396
  28. 52
  29. 32
  30. 68
  31. 56
  32. 92
  33. 44
  34. 88
  35. 81
  36. 1089
  37. 9700
  38. 792
  39. 56
  40. 36

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