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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 910 · 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. 1.594 + 495 =
  2. 2.36 × 4 =
  3. 3.9 × 5 = ?5 — what is the missing digit?
  4. 4.What comes next? 36, 49, 64, 81, ? (a) 101 (b) 98 (c) 102 (d) 100
  5. 5.7 × 9 =
  6. 6.48 × 4 =
  7. 7.What comes next? 1, 2, 4, 8, ? (a) 14 (b) 17 (c) 16 (d) 12
  8. 8.Take 83 and take away the sum of its digits. What do you get?
  9. 9.Take 957. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  10. 10.Magic square (every row, column and diagonal has the same total): 10 11 6 | 5 9 13 | 12 7 ?. What is the missing number?
  11. 11.Take 320. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  12. 12.Half of 152 =
  13. 13.9 × 10 =
  14. 14.80?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.If today is Sunday, what day was it 25 days ago? (a) Saturday (b) Thursday (c) Wednesday (d) Tuesday
  16. 16.56? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Half of 62 =
  18. 18.87 × 100 =
  19. 19.52 × ? = 5200
  20. 20.If today is Sunday, what day will it be after 18 days? (a) Wednesday (b) Thursday (c) Sunday (d) Friday
  21. 21.8 × 4 =
  22. 22.6 × 100 =
  23. 23.1 + 3 + 5 + … + 13 =
  24. 24.Magic square (every row, column and diagonal has the same total): 14 9 ? | 7 11 15 | 12 13 8. What is the missing number?
  25. 25.9 × 3 = ?7 — what is the missing digit?
  26. 26.9 × 5 = 4? — what is the missing digit?
  27. 27.Magic square (every row, column and diagonal has the same total): 21 ? 9 | 6 18 30 | 27 12 15. What is the missing number?
  28. 28.12345679 × 27 =
  29. 29.A girl is 9 years old and her brother is 2 years older. How old will her brother be in 2 years?
  30. 30.The ages of two twins add up to 22. How old is each twin?
  31. 31.9 × 1 =
  32. 32.Take 87 and take away the sum of its digits. What do you get?
  33. 33.9 × 7 = ?3 — what is the missing digit?
  34. 34.Half of 166 =
  35. 35.Take 780. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  36. 36.Magic square (every row, column and diagonal has the same total): 14 9 10 | ? 11 15 | 12 13 8. What is the missing number?
  37. 37.1 + 2 + 3 + … + 75 =
  38. 38.Take 980. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  39. 39.450 × 10 =
  40. 40.Do the 1089 trick with 731: reverse and subtract, then reverse that answer and add. What do you get?

Answer key

  1. 1089
  2. 144
  3. 4
  4. 100
  5. 63
  6. 192
  7. 16
  8. 72
  9. 198
  10. 8
  11. 297
  12. 76
  13. 90
  14. 5
  15. Wednesday
  16. 7
  17. 31
  18. 8700
  19. 100
  20. Thursday
  21. 32
  22. 600
  23. 49
  24. 10
  25. 2
  26. 5
  27. 24
  28. 333333333
  29. 13
  30. 11
  31. 9
  32. 72
  33. 6
  34. 83
  35. 693
  36. 7
  37. 2850
  38. 891
  39. 4500
  40. 1089

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