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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 944 · 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 square (every row, column and diagonal has the same total): 13 12 17 | 18 14 10 | 11 ? 15. What is the missing number?
  2. 2.1234 × 8 + 4 =
  3. 3.15 × 4 =
  4. 4.I thought of a number, multiplied it by 3 and added 2. I got 11. What was my number?
  5. 5.I thought of a number, multiplied it by 5 and added 6. I got 46. What was my number?
  6. 6.9 × 10 = 9? — what is the missing digit?
  7. 7.Magic trick! Think of 3. Double it, add 8, halve it, then take away 3. What number do you get?
  8. 8.A father is 36 years old and his son is 8. How old was the father when the son was born?
  9. 9.9 × 2 =
  10. 10.Magic square (every row, column and diagonal has the same total): 9 4 11 | 10 8 6 | 5 12 ?. What is the missing number?
  11. 11.16 × 4 =
  12. 12.42 × 100 =
  13. 13.11 × 1000 =
  14. 14.Do the 1089 trick with 663: reverse and subtract, then reverse that answer and add. What do you get?
  15. 15.1234567 × 9 + 8 =
  16. 16.Magic square (every row, column and diagonal has the same total): ? 33 12 | 15 21 27 | 30 9 24. What is the missing number?
  17. 17.Magic square (every row, column and diagonal has the same total): 6 27 12 | 21 15 ? | 18 3 24. What is the missing number?
  18. 18.29 × 1000 =
  19. 19.I thought of a number, multiplied it by 2 and added 6. I got 16. What was my number?
  20. 20.The ages of two twins add up to 28. How old is each twin?
  21. 21.9 × 3 = ?7 — what is the missing digit?
  22. 22.What comes next? 16, 18, 20, 22, ? (a) 26 (b) 22 (c) 24 (d) 25
  23. 23.Magic square (every row, column and diagonal has the same total): 7 22 19 | 28 16 4 | 13 10 ?. What is the missing number?
  24. 24.43?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.5?53 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.?021 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.888? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.1 + 2 + 3 + … + 6 =
  29. 29.Take 633. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  30. 30.I thought of a number, added 7 and then doubled it. I got 28. What was my number?
  31. 31.9 × 4 = ?6 — what is the missing digit?
  32. 32.Double 88 =
  33. 33.1 + 3 + 5 + … + 21 =
  34. 34.9 × 4 = 3? — what is the missing digit?
  35. 35.1 + 2 + 3 + … + 98 =
  36. 36.123 × 9 + 4 =
  37. 37.9 × 6 =
  38. 38.The ages of two twins add up to 20. How old is each twin?
  39. 39.5 × 9 =
  40. 40.A father is 42 years old and his son is 10. How old was the father when the son was born?

Answer key

  1. 16
  2. 9876
  3. 60
  4. 3
  5. 8
  6. 0
  7. 4
  8. 28
  9. 18
  10. 7
  11. 64
  12. 4200
  13. 11000
  14. 1089
  15. 11111111
  16. 18
  17. 9
  18. 29000
  19. 5
  20. 14
  21. 2
  22. 24
  23. 25
  24. 2
  25. 5
  26. 6
  27. 3
  28. 21
  29. 297
  30. 7
  31. 3
  32. 176
  33. 121
  34. 6
  35. 4851
  36. 1111
  37. 54
  38. 10
  39. 45
  40. 32

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