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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 468 · 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 107. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  2. 2.Take 970. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  3. 3.Magic square (every row, column and diagonal has the same total): 21 23 13 | 11 19 27 | 25 ? 17. What is the missing number?
  4. 4.9 × 4 =
  5. 5.What comes next? 20, 23, 26, 29, ? (a) 33 (b) 35 (c) 29 (d) 32
  6. 6.Double 21 =
  7. 7.381 × ? = 3810
  8. 8.12 × 9 + 3 =
  9. 9.Magic square (every row, column and diagonal has the same total): 15 8 13 | 10 12 14 | 11 16 ?. What is the missing number?
  10. 10.9 × 9 =
  11. 11.Take 51 and take away the sum of its digits. What do you get?
  12. 12.11 × 11 =
  13. 13.8?46 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.What comes next? 10, 18, 26, 34, ? (a) 34 (b) 50 (c) 43 (d) 42
  15. 15.9 × 4 = ?6 — what is the missing digit?
  16. 16.Magic trick! Think of 16. Double it, add 8, halve it, then take away 16. What number do you get?
  17. 17.12345 × 8 + 5 =
  18. 18.If today is Thursday, what day was it 49 days ago? (a) Sunday (b) Wednesday (c) Thursday (d) Friday
  19. 19.9 × 3 = ?7 — what is the missing digit?
  20. 20.What comes next? 1, 2, 4, 8, ? (a) 16 (b) 14 (c) 17 (d) 12
  21. 21.4 × 1000 =
  22. 22.9 × 4 = 3? — what is the missing digit?
  23. 23.9 × 7 =
  24. 24.15 × 4 =
  25. 25.If today is Thursday, what day will it be after 34 days? (a) Thursday (b) Wednesday (c) Tuesday (d) Saturday
  26. 26.The 7th of a month is a Saturday. What day is the 24th of the same month? (a) Tuesday (b) Monday (c) Wednesday (d) Friday
  27. 27.3 × 9 =
  28. 28.495 + 594 =
  29. 29.In 3 years a boy will be 13 years old. How old was he 2 years ago?
  30. 30.What comes next? 5, 10, 20, 40, ? (a) 80 (b) 70 (c) 60 (d) 81
  31. 31.42 × 4 =
  32. 32.I thought of a number, multiplied it by 4 and added 9. I got 41. What was my number?
  33. 33.Take 490. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  34. 34.Magic square (every row, column and diagonal has the same total): 26 11 14 | 5 17 29 | 20 ? 8. What is the missing number?
  35. 35.12345679 × 18 =
  36. 36.?51 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.In 4 years a boy will be 18 years old. How old was he 3 years ago?
  38. 38.9 × 6 =
  39. 39.A father is 34 years old and his son is 6. How old was the father when the son was born?
  40. 40.Do the 1089 trick with 831: reverse and subtract, then reverse that answer and add. What do you get?

Answer key

  1. 594
  2. 891
  3. 15
  4. 36
  5. 32
  6. 42
  7. 10
  8. 111
  9. 9
  10. 81
  11. 45
  12. 121
  13. 9
  14. 42
  15. 3
  16. 4
  17. 98765
  18. Thursday
  19. 2
  20. 16
  21. 4000
  22. 6
  23. 63
  24. 60
  25. Wednesday
  26. Tuesday
  27. 27
  28. 1089
  29. 8
  30. 80
  31. 168
  32. 8
  33. 396
  34. 23
  35. 222222222
  36. 3
  37. 11
  38. 54
  39. 28
  40. 1089

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