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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 448 · 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.Take 27 and take away the sum of its digits. What do you get?
  2. 2.9 × 4 = ?6 — what is the missing digit?
  3. 3.20 × 100 =
  4. 4.I thought of a number, added 6 and then doubled it. I got 22. What was my number?
  5. 5.37 × 12 =
  6. 6.16?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.9 × 1 =
  8. 8.9 × 2 = 1? — what is the missing digit?
  9. 9.9 × 5 =
  10. 10.12345 × 9 + 6 =
  11. 11.Odd one out: which number is NOT in the 8 times table? (a) 32 (b) 51 (c) 48 (d) 40
  12. 12.In 5 years a boy will be 19 years old. How old was he 7 years ago?
  13. 13.9 × 10 =
  14. 14.Take 92 and take away the sum of its digits. What do you get?
  15. 15.Half of 92 =
  16. 16.9 × 6 = ?4 — what is the missing digit?
  17. 17.1 + 2 + 3 + … + 28 =
  18. 18.36 × 4 =
  19. 19.If today is Sunday, what day will it be after 49 days? (a) Monday (b) Wednesday (c) Saturday (d) Sunday
  20. 20.If today is Saturday, what day will it be after 94 days? (a) Tuesday (b) Monday (c) Friday (d) Wednesday
  21. 21.Take 258. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  22. 22.17 × 4 =
  23. 23.9 × 10 = ?0 — what is the missing digit?
  24. 24.Magic square (every row, column and diagonal has the same total): ? 5 10 | 7 9 11 | 8 13 6. What is the missing number?
  25. 25.85?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.If today is Thursday, what day was it 56 days ago? (a) Thursday (b) Wednesday (c) Friday (d) Sunday
  27. 27.If today is Friday, what day will it be after 70 days? (a) Saturday (b) Thursday (c) Monday (d) Friday
  28. 28.123456 × 9 + 7 =
  29. 29.In 2 years a boy will be 10 years old. How old was he 3 years ago?
  30. 30.742 × ? = 7420
  31. 31.9 × 3 = ?7 — what is the missing digit?
  32. 32.Think of 2. Multiply it by 4, then add 1. What number do you end with?
  33. 33.Think of 6. Multiply it by 5, then add 6. What number do you end with?
  34. 34.Double 14 =
  35. 35.Odd one out: which number is NOT in the 4 times table? (a) 32 (b) 28 (c) 13 (d) 16
  36. 36.1 + 3 + 5 + … + 37 =
  37. 37.What comes next? 1, 10, 19, 28, ? (a) 37 (b) 38 (c) 28 (d) 46
  38. 38.1 + 2 + 3 + … + 36 =
  39. 39.Magic square (every row, column and diagonal has the same total): 9 8 ? | 14 10 6 | 7 12 11. What is the missing number?
  40. 40.111111 × 111111 =

Answer key

  1. 18
  2. 3
  3. 2000
  4. 5
  5. 444
  6. 5
  7. 9
  8. 8
  9. 45
  10. 111111
  11. 51
  12. 7
  13. 90
  14. 81
  15. 46
  16. 5
  17. 406
  18. 144
  19. Sunday
  20. Tuesday
  21. 594
  22. 68
  23. 9
  24. 12
  25. 2
  26. Thursday
  27. Friday
  28. 1111111
  29. 5
  30. 10
  31. 2
  32. 9
  33. 36
  34. 28
  35. 13
  36. 361
  37. 37
  38. 666
  39. 13
  40. 12345654321

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