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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 616 · 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. 1.98 × 100 =
  2. 2.9 × 3 = 2? — what is the missing digit?
  3. 3.If today is Thursday, what day will it be after 31 days? (a) Monday (b) Saturday (c) Wednesday (d) Sunday
  4. 4.Magic square (every row, column and diagonal has the same total): 12 13 8 | 7 ? 15 | 14 9 10. What is the missing number?
  5. 5.If today is Monday, what day was it 36 days ago? (a) Wednesday (b) Saturday (c) Sunday (d) Monday
  6. 6.9 × 8 = 7? — what is the missing digit?
  7. 7.A father is 41 years old and his son is 7. How old was the father when the son was born?
  8. 8.?839 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Magic trick! Think of 18. Double it, add 10, halve it, then take away 18. What number do you get?
  10. 10.Magic square (every row, column and diagonal has the same total): 21 ? 13 | 11 19 27 | 25 15 17. What is the missing number?
  11. 11.Magic square (every row, column and diagonal has the same total): 9 ? 7 | 4 6 8 | 5 10 3. What is the missing number?
  12. 12.If today is Monday, what day will it be after 74 days? (a) Thursday (b) Monday (c) Saturday (d) Friday
  13. 13.What comes next? 25, 36, 49, 64, ? (a) 81 (b) 79 (c) 83 (d) 82
  14. 14.Double 79 =
  15. 15.9 × 7 = ?3 — what is the missing digit?
  16. 16.12345679 × 27 =
  17. 17.If today is Wednesday, what day was it 26 days ago? (a) Monday (b) Saturday (c) Friday (d) Thursday
  18. 18.9 × 10 = 9? — what is the missing digit?
  19. 19.Take 411. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  20. 20.16 × 4 =
  21. 21.Odd one out: which number is NOT in the 4 times table? (a) 24 (b) 32 (c) 14 (d) 12
  22. 22.6 × 9 =
  23. 23.Half of 72 =
  24. 24.In 5 years a boy will be 19 years old. How old was he 7 years ago?
  25. 25.9 × 7 = 6? — what is the missing digit?
  26. 26.Take 88 and take away the sum of its digits. What do you get?
  27. 27.I thought of a number, added 5 and then doubled it. I got 28. What was my number?
  28. 28.What comes next? 3, 6, 12, 24, ? (a) 36 (b) 49 (c) 48 (d) 42
  29. 29.What comes next? 10, 14, 18, 22, ? (a) 22 (b) 27 (c) 26 (d) 30
  30. 30.7 × ? = 700
  31. 31.?082 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.A girl is 8 years old and her brother is 3 years older. How old will her brother be in 5 years?
  33. 33.Do the 1089 trick with 967: reverse and subtract, then reverse that answer and add. What do you get?
  34. 34.44 × 4 =
  35. 35.Magic square (every row, column and diagonal has the same total): 12 ? 14 | 13 11 9 | 8 15 10. What is the missing number?
  36. 36.37 × 6 =
  37. 37.123 × 9 + 4 =
  38. 38.I thought of a number, added 5 and then doubled it. I got 36. What was my number?
  39. 39.A girl is 6 years old and her brother is 4 years older. How old will her brother be in 4 years?
  40. 40.Take 940. Reverse its digits and take the smaller number away from the bigger one. What do you get?

Answer key

  1. 9800
  2. 7
  3. Sunday
  4. 11
  5. Sunday
  6. 2
  7. 34
  8. 7
  9. 5
  10. 23
  11. 2
  12. Friday
  13. 81
  14. 158
  15. 6
  16. 333333333
  17. Friday
  18. 0
  19. 297
  20. 64
  21. 14
  22. 54
  23. 36
  24. 7
  25. 3
  26. 72
  27. 9
  28. 48
  29. 26
  30. 100
  31. 8
  32. 16
  33. 1089
  34. 176
  35. 7
  36. 222
  37. 1111
  38. 13
  39. 14
  40. 891

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