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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 199 · 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. 1.41 × 1000 =
  2. 2.2?67 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.12345679 × 45 =
  4. 4.Take 36 and take away the sum of its digits. What do you get?
  5. 5.9 × 3 = 2? — what is the missing digit?
  6. 6.What comes next? 2, 4, 8, 16, ? (a) 24 (b) 28 (c) 32 (d) 33
  7. 7.Double 47 =
  8. 8.I thought of a number, multiplied it by 5 and added 2. I got 37. What was my number?
  9. 9.9 × 10 =
  10. 10.12345679 × 9 =
  11. 11.1234567 × 8 + 7 =
  12. 12.Odd one out: which number is NOT in the 3 times table? (a) 12 (b) 28 (c) 15 (d) 21
  13. 13.12345678 × 9 + 9 =
  14. 14.Take 96 and take away the sum of its digits. What do you get?
  15. 15.What comes next? 1, 4, 7, 10, ? (a) 14 (b) 16 (c) 10 (d) 13
  16. 16.1 × 9 =
  17. 17.9 × 4 = ?6 — what is the missing digit?
  18. 18.Half of 144 =
  19. 19.If today is Friday, what day will it be after 14 days? (a) Saturday (b) Thursday (c) Friday (d) Monday
  20. 20.Magic trick! Think of 5. Double it, add 18, halve it, then take away 5. What number do you get?
  21. 21.874 × 10 =
  22. 22.The ages of two twins add up to 28. How old is each twin?
  23. 23.Magic square (every row, column and diagonal has the same total): 19 4 25 | 22 16 10 | ? 28 13. What is the missing number?
  24. 24.814 × ? = 8140
  25. 25.1 + 2 + 3 + … + 42 =
  26. 26.A father is 35 years old and his son is 4. How old was the father when the son was born?
  27. 27.9 × 2 = ?8 — what is the missing digit?
  28. 28.What comes next? 5, 10, 20, 40, ? (a) 81 (b) 70 (c) 80 (d) 60
  29. 29.Magic square (every row, column and diagonal has the same total): 33 12 27 | 18 24 ? | 21 36 15. What is the missing number?
  30. 30.I thought of a number, multiplied it by 4 and added 4. I got 12. What was my number?
  31. 31.1 + 2 + 3 + … + 63 =
  32. 32.47 × 100 =
  33. 33.Take 76 and take away the sum of its digits. What do you get?
  34. 34.26 × 4 =
  35. 35.9 × 6 = 5? — what is the missing digit?
  36. 36.A father is 32 years old and his son is 10. How old was the father when the son was born?
  37. 37.12345 × 9 + 6 =
  38. 38.447 × 10 =
  39. 39.1 + 2 + 3 + … + 68 =
  40. 40.1234567 × 9 + 8 =

Answer key

  1. 41000
  2. 3
  3. 555555555
  4. 27
  5. 7
  6. 32
  7. 94
  8. 7
  9. 90
  10. 111111111
  11. 9876543
  12. 28
  13. 111111111
  14. 81
  15. 13
  16. 9
  17. 3
  18. 72
  19. Friday
  20. 9
  21. 8740
  22. 14
  23. 7
  24. 10
  25. 903
  26. 31
  27. 1
  28. 80
  29. 30
  30. 2
  31. 2016
  32. 4700
  33. 63
  34. 104
  35. 4
  36. 22
  37. 111111
  38. 4470
  39. 2346
  40. 11111111

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