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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 97 · 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. 1.9 × 10 =
  2. 2.28 × 4 =
  3. 3.10 × 9 =
  4. 4.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
  5. 5.1 + 2 + 3 + … + 42 =
  6. 6.Take 881. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  7. 7.1 + 3 + 5 + … + 9 =
  8. 8.Double 21 =
  9. 9.9 × 6 = ?4 — what is the missing digit?
  10. 10.1234567 × 9 + 8 =
  11. 11.What comes next? 1, 2, 4, 8, ? (a) 14 (b) 16 (c) 12 (d) 17
  12. 12.9 × 7 = 6? — what is the missing digit?
  13. 13.Think of 10. Multiply it by 3, then add 5. What number do you end with?
  14. 14.1 × 9 =
  15. 15.9 × 2 = 1? — what is the missing digit?
  16. 16.9 × 10 = 9? — what is the missing digit?
  17. 17.Take 680. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  18. 18.Half of 154 =
  19. 19.4?56 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.The 8th of a month is a Friday. What day is the 16th of the same month? (a) Sunday (b) Friday (c) Tuesday (d) Saturday
  21. 21.53 × 4 =
  22. 22.25 × 4 =
  23. 23.26 × ? = 26000
  24. 24.21 × 4 =
  25. 25.Magic square (every row, column and diagonal has the same total): 16 2 12 | 6 10 14 | ? 18 4. What is the missing number?
  26. 26.I thought of a number, added 6 and then doubled it. I got 32. What was my number?
  27. 27.Double 63 =
  28. 28.40 × 4 =
  29. 29.Half of 114 =
  30. 30.9 × 2 = ?8 — what is the missing digit?
  31. 31.Double 56 =
  32. 32.31 × 1000 =
  33. 33.54 × ? = 540
  34. 34.20 × ? = 2000
  35. 35.Take 189. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  36. 36.9 × 3 = ?7 — what is the missing digit?
  37. 37.21 × 1000 =
  38. 38.If today is Monday, what day will it be after 79 days? (a) Tuesday (b) Saturday (c) Wednesday (d) Thursday
  39. 39.9 × 2 =
  40. 40.Do the 1089 trick with 417: reverse and subtract, then reverse that answer and add. What do you get?

Answer key

  1. 90
  2. 112
  3. 90
  4. 792
  5. 903
  6. 693
  7. 25
  8. 42
  9. 5
  10. 11111111
  11. 16
  12. 3
  13. 35
  14. 9
  15. 8
  16. 0
  17. 594
  18. 77
  19. 3
  20. Saturday
  21. 212
  22. 100
  23. 1000
  24. 84
  25. 8
  26. 10
  27. 126
  28. 160
  29. 57
  30. 1
  31. 112
  32. 31000
  33. 10
  34. 100
  35. 792
  36. 2
  37. 21000
  38. Wednesday
  39. 18
  40. 1089

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