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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 552 · 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. 1.34 × 100 =
  2. 2.The 1st of a month is a Sunday. What day is the 14th of the same month? (a) Tuesday (b) Sunday (c) Friday (d) Saturday
  3. 3.Take 66 and take away the sum of its digits. What do you get?
  4. 4.What comes next? 9, 16, 25, 36, ? (a) 47 (b) 51 (c) 50 (d) 49
  5. 5.46 × 100 =
  6. 6.9 × 10 =
  7. 7.195 × 10 =
  8. 8.Half of 46 =
  9. 9.9 × 9 = 8? — what is the missing digit?
  10. 10.If today is Friday, what day was it 9 days ago? (a) Tuesday (b) Wednesday (c) Saturday (d) Thursday
  11. 11.9 × 10 = ?0 — what is the missing digit?
  12. 12.Magic square (every row, column and diagonal has the same total): ? 10 25 | 16 22 28 | 19 34 13. What is the missing number?
  13. 13.9 × 1 =
  14. 14.Odd one out: which number is NOT in the 9 times table? (a) 27 (b) 36 (c) 55 (d) 63
  15. 15.Do the 1089 trick with 940: reverse and subtract, then reverse that answer and add. What do you get?
  16. 16.I thought of a number, added 4 and then doubled it. I got 48. What was my number?
  17. 17.Take 500. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  18. 18.Half of 172 =
  19. 19.9 × 7 = 6? — what is the missing digit?
  20. 20.Take 783. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  21. 21.123456 × 9 + 7 =
  22. 22.What comes next? 14, 21, 28, 35, ? (a) 49 (b) 35 (c) 43 (d) 42
  23. 23.1 + 2 + 3 + … + 29 =
  24. 24.61?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.Double 71 =
  26. 26.In 3 years a boy will be 16 years old. How old was he 2 years ago?
  27. 27.9 × 5 = ?5 — what is the missing digit?
  28. 28.I thought of a number, added 4 and then doubled it. I got 20. What was my number?
  29. 29.Take 13 and take away the sum of its digits. What do you get?
  30. 30.563 × ? = 5630
  31. 31.22 × 4 =
  32. 32.Think of 12. Multiply it by 2, then add 6. What number do you end with?
  33. 33.What comes next? 3, 6, 12, 24, ? (a) 49 (b) 36 (c) 48 (d) 42
  34. 34.9 × 4 =
  35. 35.A father is 42 years old and his son is 11. How old was the father when the son was born?
  36. 36.Double 61 =
  37. 37.Take 86 and take away the sum of its digits. What do you get?
  38. 38.Magic square (every row, column and diagonal has the same total): 22 12 14 | 8 16 24 | 18 20 ?. What is the missing number?
  39. 39.What comes next? 1, 2, 4, 8, ? (a) 14 (b) 17 (c) 16 (d) 12
  40. 40.Take 81 and take away the sum of its digits. What do you get?

Answer key

  1. 3400
  2. Saturday
  3. 54
  4. 49
  5. 4600
  6. 90
  7. 1950
  8. 23
  9. 1
  10. Wednesday
  11. 9
  12. 31
  13. 9
  14. 55
  15. 1089
  16. 20
  17. 495
  18. 86
  19. 3
  20. 396
  21. 1111111
  22. 42
  23. 435
  24. 6
  25. 142
  26. 11
  27. 4
  28. 6
  29. 9
  30. 10
  31. 88
  32. 30
  33. 48
  34. 36
  35. 31
  36. 122
  37. 72
  38. 10
  39. 16
  40. 72

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