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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 861 · 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.Magic trick! Think of 14. Double it, add 6, halve it, then take away 14. What number do you get?
  2. 2.25 × 4 =
  3. 3.Think of 10. Multiply it by 5, then add 5. What number do you end with?
  4. 4.26?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.13 × 1000 =
  6. 6.792 + 297 =
  7. 7.12345679 × 63 =
  8. 8.9 × 5 = ?5 — what is the missing digit?
  9. 9.1 + 2 + 3 + … + 93 =
  10. 10.The ages of two twins add up to 18. How old is each twin?
  11. 11.9 × 4 = ?6 — what is the missing digit?
  12. 12.Double 29 =
  13. 13.Magic square (every row, column and diagonal has the same total): 3 8 7 | 10 6 2 | 5 4 ?. What is the missing number?
  14. 14.Magic square (every row, column and diagonal has the same total): 30 15 18 | ? 21 33 | 24 27 12. What is the missing number?
  15. 15.?205 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.83 × 100 =
  17. 17.715 × 10 =
  18. 18.Magic square (every row, column and diagonal has the same total): 8 ? 4 | 1 5 9 | 6 7 2. What is the missing number?
  19. 19.What comes next? 9, 16, 25, 36, ? (a) 50 (b) 51 (c) 47 (d) 49
  20. 20.Magic square (every row, column and diagonal has the same total): 26 5 20 | 11 17 ? | 14 29 8. What is the missing number?
  21. 21.37 × 9 =
  22. 22.Do the 1089 trick with 278: reverse and subtract, then reverse that answer and add. What do you get?
  23. 23.8 × 9 =
  24. 24.610 × 10 =
  25. 25.Magic trick! Think of 19. Double it, add 12, halve it, then take away 19. What number do you get?
  26. 26.If today is Saturday, what day was it 57 days ago? (a) Saturday (b) Monday (c) Friday (d) Thursday
  27. 27.1 + 2 + 3 + … + 79 =
  28. 28.131 × 10 =
  29. 29.5 × 9 =
  30. 30.3?61 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.9 × 2 =
  32. 32.9 × 4 = 3? — what is the missing digit?
  33. 33.Double 25 =
  34. 34.9 × 6 = ?4 — what is the missing digit?
  35. 35.I thought of a number, multiplied it by 5 and added 3. I got 73. What was my number?
  36. 36.1 + 2 + 3 + … + 25 =
  37. 37.4 × 9 =
  38. 38.9 × 9 = ?1 — what is the missing digit?
  39. 39.195 × 10 =
  40. 40.1 + 2 + 3 + … + 88 =

Answer key

  1. 3
  2. 100
  3. 55
  4. 5
  5. 13000
  6. 1089
  7. 777777777
  8. 4
  9. 4371
  10. 9
  11. 3
  12. 58
  13. 9
  14. 9
  15. 2
  16. 8300
  17. 7150
  18. 3
  19. 49
  20. 23
  21. 333
  22. 1089
  23. 72
  24. 6100
  25. 6
  26. Friday
  27. 3160
  28. 1310
  29. 45
  30. 8
  31. 18
  32. 6
  33. 50
  34. 5
  35. 14
  36. 325
  37. 36
  38. 8
  39. 1950
  40. 3916

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