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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 963 · 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. 1.37 × 4 =
  2. 2.What comes next? 9, 16, 25, 36, ? (a) 47 (b) 51 (c) 50 (d) 49
  3. 3.Half of 146 =
  4. 4.Take 23 and take away the sum of its digits. What do you get?
  5. 5.12345679 × 27 =
  6. 6.Magic square (every row, column and diagonal has the same total): 8 13 6 | 7 9 11 | ? 5 10. What is the missing number?
  7. 7.Take 72 and take away the sum of its digits. What do you get?
  8. 8.2 × 9 =
  9. 9.In 2 years a boy will be 16 years old. How old was he 3 years ago?
  10. 10.1 + 2 + 3 + … + 52 =
  11. 11.Magic square (every row, column and diagonal has the same total): 16 6 20 | 18 14 ? | 8 22 12. What is the missing number?
  12. 12.1111 × 1111 =
  13. 13.Half of 172 =
  14. 14.12345679 × 18 =
  15. 15.9 × 2 =
  16. 16.Do the 1089 trick with 640: reverse and subtract, then reverse that answer and add. What do you get?
  17. 17.37 × 27 =
  18. 18.9 × 3 =
  19. 19.Half of 68 =
  20. 20.Double 28 =
  21. 21.Magic square (every row, column and diagonal has the same total): 20 23 8 | 5 ? 29 | 26 11 14. What is the missing number?
  22. 22.37 × 15 =
  23. 23.93 × 100 =
  24. 24.Magic square (every row, column and diagonal has the same total): 16 18 8 | ? 14 22 | 20 10 12. What is the missing number?
  25. 25.Half of 46 =
  26. 26.If today is Friday, what day was it 15 days ago? (a) Friday (b) Sunday (c) Thursday (d) Wednesday
  27. 27.In 5 years a boy will be 16 years old. How old was he 3 years ago?
  28. 28.The ages of two twins add up to 22. How old is each twin?
  29. 29.9 × 3 = 2? — what is the missing digit?
  30. 30.Take 15 and take away the sum of its digits. What do you get?
  31. 31.I thought of a number, added 9 and then doubled it. I got 32. What was my number?
  32. 32.What comes next? 1, 4, 9, 16, ? (a) 27 (b) 23 (c) 26 (d) 25
  33. 33.9 × 6 = ?4 — what is the missing digit?
  34. 34.12345679 × 9 =
  35. 35.Magic square (every row, column and diagonal has the same total): 25 10 13 | 4 ? 28 | 19 22 7. What is the missing number?
  36. 36.3 × 9 =
  37. 37.56 × 4 =
  38. 38.9 × 6 = 5? — what is the missing digit?
  39. 39.2?02 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.I thought of a number, multiplied it by 4 and added 4. I got 24. What was my number?

Answer key

  1. 148
  2. 49
  3. 73
  4. 18
  5. 333333333
  6. 12
  7. 63
  8. 18
  9. 11
  10. 1378
  11. 10
  12. 1234321
  13. 86
  14. 222222222
  15. 18
  16. 1089
  17. 999
  18. 27
  19. 34
  20. 56
  21. 17
  22. 555
  23. 9300
  24. 6
  25. 23
  26. Thursday
  27. 8
  28. 11
  29. 7
  30. 9
  31. 7
  32. 25
  33. 5
  34. 111111111
  35. 16
  36. 27
  37. 224
  38. 4
  39. 5
  40. 5

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