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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 399 · 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.A father is 35 years old and his son is 5. How old was the father when the son was born?
  2. 2.Magic square (every row, column and diagonal has the same total): 10 15 8 | 9 11 13 | 14 ? 12. What is the missing number?
  3. 3.37 × 4 =
  4. 4.12345 × 9 + 6 =
  5. 5.1 + 3 + 5 + … + 41 =
  6. 6.17 × 4 =
  7. 7.The 3rd of a month is a Tuesday. What day is the 16th of the same month? (a) Sunday (b) Monday (c) Tuesday (d) Thursday
  8. 8.541 × 10 =
  9. 9.I thought of a number, multiplied it by 4 and added 2. I got 42. What was my number?
  10. 10.Take 610. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  11. 11.Half of 18 =
  12. 12.9 × 10 = ?0 — what is the missing digit?
  13. 13.Magic square (every row, column and diagonal has the same total): 5 10 ? | 4 6 8 | 9 2 7. What is the missing number?
  14. 14.The ages of two twins add up to 12. How old is each twin?
  15. 15.The 2nd of a month is a Tuesday. What day is the 15th of the same month? (a) Thursday (b) Sunday (c) Monday (d) Tuesday
  16. 16.What comes next? 25, 36, 49, 64, ? (a) 83 (b) 79 (c) 82 (d) 81
  17. 17.Half of 62 =
  18. 18.9 × 1 =
  19. 19.9 × 5 = ?5 — what is the missing digit?
  20. 20.Take 36 and take away the sum of its digits. What do you get?
  21. 21.9 × ? = 9000
  22. 22.6 × 9 =
  23. 23.12 × 9 + 3 =
  24. 24.9 × 6 = ?4 — what is the missing digit?
  25. 25.What comes next? 7, 13, 19, 25, ? (a) 37 (b) 31 (c) 25 (d) 32
  26. 26.9 × 6 = 5? — what is the missing digit?
  27. 27.Do the 1089 trick with 600: reverse and subtract, then reverse that answer and add. What do you get?
  28. 28.Half of 172 =
  29. 29.Take 87 and take away the sum of its digits. What do you get?
  30. 30.A father is 38 years old and his son is 9. How old was the father when the son was born?
  31. 31.Magic square (every row, column and diagonal has the same total): 27 ? 21 | 12 18 24 | 15 30 9. What is the missing number?
  32. 32.9 × 3 = ?7 — what is the missing digit?
  33. 33.What comes next? 1, 4, 7, 10, ? (a) 13 (b) 16 (c) 14 (d) 10
  34. 34.31 × 100 =
  35. 35.Magic square (every row, column and diagonal has the same total): 19 34 13 | 16 22 28 | 31 10 ?. What is the missing number?
  36. 36.36 × 4 =
  37. 37.13 × 1000 =
  38. 38.If today is Sunday, what day will it be after 85 days? (a) Monday (b) Thursday (c) Sunday (d) Tuesday
  39. 39.Odd one out: which number is NOT in the 4 times table? (a) 8 (b) 31 (c) 20 (d) 28
  40. 40.Do the 1089 trick with 955: reverse and subtract, then reverse that answer and add. What do you get?

Answer key

  1. 30
  2. 7
  3. 148
  4. 111111
  5. 441
  6. 68
  7. Monday
  8. 5410
  9. 10
  10. 594
  11. 9
  12. 9
  13. 3
  14. 6
  15. Monday
  16. 81
  17. 31
  18. 9
  19. 4
  20. 27
  21. 1000
  22. 54
  23. 111
  24. 5
  25. 31
  26. 4
  27. 1089
  28. 86
  29. 72
  30. 29
  31. 6
  32. 2
  33. 13
  34. 3100
  35. 25
  36. 144
  37. 13000
  38. Monday
  39. 31
  40. 1089

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