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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 820 · 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. 1.74 × 100 =
  2. 2.Magic trick! Think of 8. Double it, add 10, halve it, then take away 8. What number do you get?
  3. 3.9 × 4 = ?6 — what is the missing digit?
  4. 4.1 + 2 + 3 + … + 75 =
  5. 5.12345679 × 9 =
  6. 6.?317 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.37 × 6 =
  8. 8.Take 80 and take away the sum of its digits. What do you get?
  9. 9.Double 36 =
  10. 10.10 × 9 =
  11. 11.6 × 9 =
  12. 12.39 × 4 =
  13. 13.9 × 2 =
  14. 14.9 × 2 = ?8 — what is the missing digit?
  15. 15.9 × 4 = 3? — what is the missing digit?
  16. 16.What comes next? 9, 16, 25, 36, ? (a) 51 (b) 50 (c) 47 (d) 49
  17. 17.9 × 10 =
  18. 18.3 × 9 =
  19. 19.I thought of a number, multiplied it by 4 and added 2. I got 30. What was my number?
  20. 20.If today is Monday, what day will it be after 59 days? (a) Wednesday (b) Thursday (c) Friday (d) Sunday
  21. 21.47 × 4 =
  22. 22.693 + 396 =
  23. 23.The ages of two twins add up to 30. How old is each twin?
  24. 24.1 + 2 + 3 + … + 74 =
  25. 25.1 + 2 + 3 + … + 19 =
  26. 26.Take 793. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  27. 27.501? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.What comes next? 2, 4, 8, 16, ? (a) 28 (b) 32 (c) 33 (d) 24
  29. 29.Half of 76 =
  30. 30.Odd one out: which number is NOT in the 4 times table? (a) 12 (b) 32 (c) 38 (d) 24
  31. 31.If today is Sunday, what day will it be after 42 days? (a) Wednesday (b) Monday (c) Sunday (d) Saturday
  32. 32.1 + 2 + 3 + … + 16 =
  33. 33.57 × 4 =
  34. 34.Magic trick! Think of 18. Double it, add 8, halve it, then take away 18. What number do you get?
  35. 35.1 + 2 + 3 + … + 7 =
  36. 36.9 × 4 =
  37. 37.9 × 6 = ?4 — what is the missing digit?
  38. 38.12345678 × 8 + 8 =
  39. 39.The 3rd of a month is a Monday. What day is the 14th of the same month? (a) Thursday (b) Friday (c) Monday (d) Saturday
  40. 40.12345679 × 72 =

Answer key

  1. 7400
  2. 5
  3. 3
  4. 2850
  5. 111111111
  6. 7
  7. 222
  8. 72
  9. 72
  10. 90
  11. 54
  12. 156
  13. 18
  14. 1
  15. 6
  16. 49
  17. 90
  18. 27
  19. 7
  20. Thursday
  21. 188
  22. 1089
  23. 15
  24. 2775
  25. 190
  26. 396
  27. 3
  28. 32
  29. 38
  30. 38
  31. Sunday
  32. 136
  33. 228
  34. 4
  35. 28
  36. 36
  37. 5
  38. 98765432
  39. Friday
  40. 888888888

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