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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 847 · 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 × 5 =
  2. 2.9 × 10 = 9? — what is the missing digit?
  3. 3.16 × ? = 16000
  4. 4.423 × ? = 4230
  5. 5.I thought of a number, multiplied it by 5 and added 9. I got 24. What was my number?
  6. 6.Half of 124 =
  7. 7.66 × ? = 6600
  8. 8.12345679 × 54 =
  9. 9.45 × 4 =
  10. 10.Take 76 and take away the sum of its digits. What do you get?
  11. 11.Take 82 and take away the sum of its digits. What do you get?
  12. 12.Double 44 =
  13. 13.Do the 1089 trick with 764: reverse and subtract, then reverse that answer and add. What do you get?
  14. 14.123 × 9 + 4 =
  15. 15.10 × 4 =
  16. 16.5 × ? = 500
  17. 17.1 + 2 + 3 + … + 72 =
  18. 18.Magic trick! Think of 19. Double it, add 6, halve it, then take away 19. What number do you get?
  19. 19.48?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.8 × 9 =
  21. 21.1 + 3 + 5 + … + 27 =
  22. 22.Think of 10. Multiply it by 3, then add 8. What number do you end with?
  23. 23.2 × 9 =
  24. 24.71 × 10 =
  25. 25.9 × 10 =
  26. 26.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
  27. 27.7 × 9 =
  28. 28.Magic square (every row, column and diagonal has the same total): 24 27 12 | ? 21 33 | 30 15 18. What is the missing number?
  29. 29.In 2 years a boy will be 14 years old. How old was he 2 years ago?
  30. 30.21 × 4 =
  31. 31.Take 294. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  32. 32.Magic square (every row, column and diagonal has the same total): 14 35 20 | ? 23 17 | 26 11 32. What is the missing number?
  33. 33.Magic square (every row, column and diagonal has the same total): ? 3 4 | 1 5 9 | 6 7 2. What is the missing number?
  34. 34.9 × 7 = 6? — what is the missing digit?
  35. 35.Magic square (every row, column and diagonal has the same total): 12 13 8 | 7 11 ? | 14 9 10. What is the missing number?
  36. 36.10 × 9 =
  37. 37.If today is Wednesday, what day was it 30 days ago? (a) Monday (b) Sunday (c) Tuesday (d) Thursday
  38. 38.Magic square (every row, column and diagonal has the same total): 20 5 26 | 23 17 ? | 8 29 14. What is the missing number?
  39. 39.1 × 9 =
  40. 40.9 × 3 = 2? — what is the missing digit?

Answer key

  1. 45
  2. 0
  3. 1000
  4. 10
  5. 3
  6. 62
  7. 100
  8. 666666666
  9. 180
  10. 63
  11. 72
  12. 88
  13. 1089
  14. 1111
  15. 40
  16. 100
  17. 2628
  18. 3
  19. 6
  20. 72
  21. 196
  22. 38
  23. 18
  24. 710
  25. 90
  26. 594
  27. 63
  28. 9
  29. 10
  30. 84
  31. 198
  32. 29
  33. 8
  34. 3
  35. 15
  36. 90
  37. Monday
  38. 11
  39. 9
  40. 7

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