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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 286 · 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. 1.38 × 1000 =
  2. 2.If today is Saturday, what day was it 20 days ago? (a) Saturday (b) Monday (c) Sunday (d) Wednesday
  3. 3.9 × 3 =
  4. 4.1 + 3 + 5 + … + 11 =
  5. 5.14 × 4 =
  6. 6.Magic square (every row, column and diagonal has the same total): 12 22 8 | 10 14 18 | 20 6 ?. What is the missing number?
  7. 7.230 × ? = 2300
  8. 8.The 9th of a month is a Tuesday. What day is the 29th of the same month? (a) Thursday (b) Sunday (c) Tuesday (d) Monday
  9. 9.I thought of a number, multiplied it by 4 and added 4. I got 40. What was my number?
  10. 10.If today is Monday, what day will it be after 55 days? (a) Sunday (b) Saturday (c) Wednesday (d) Monday
  11. 11.37 × 27 =
  12. 12.6 × 4 =
  13. 13.What comes next? 5, 10, 20, 40, ? (a) 70 (b) 81 (c) 60 (d) 80
  14. 14.30 × 4 =
  15. 15.985 × ? = 9850
  16. 16.9 × 7 = ?3 — what is the missing digit?
  17. 17.Odd one out: which number is NOT in the 8 times table? (a) 56 (b) 43 (c) 32 (d) 80
  18. 18.I thought of a number, multiplied it by 2 and added 5. I got 13. What was my number?
  19. 19.Magic square (every row, column and diagonal has the same total): 15 ? 27 | 36 24 12 | 21 18 33. What is the missing number?
  20. 20.1 × 9 =
  21. 21.Double 31 =
  22. 22.Do the 1089 trick with 490: reverse and subtract, then reverse that answer and add. What do you get?
  23. 23.872 × ? = 8720
  24. 24.Magic square (every row, column and diagonal has the same total): 11 32 17 | 26 20 14 | ? 8 29. What is the missing number?
  25. 25.Magic square (every row, column and diagonal has the same total): 14 16 6 | 4 ? 20 | 18 8 10. What is the missing number?
  26. 26.37 × 6 =
  27. 27.1 + 2 + 3 + … + 100 =
  28. 28.666 × 10 =
  29. 29.Take 830. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  30. 30.9 × 10 = ?0 — what is the missing digit?
  31. 31.34 × 1000 =
  32. 32.14 × 100 =
  33. 33.1 + 2 + 3 + … + 9 =
  34. 34.1?73 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.The 4th of a month is a Friday. What day is the 17th of the same month? (a) Wednesday (b) Friday (c) Sunday (d) Thursday
  36. 36.9 × 10 = 9? — what is the missing digit?
  37. 37.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  38. 38.Double 55 =
  39. 39.Magic square (every row, column and diagonal has the same total): 12 26 16 | 22 18 ? | 20 10 24. What is the missing number?
  40. 40.A father is 45 years old and his son is 9. How old was the father when the son was born?

Answer key

  1. 38000
  2. Sunday
  3. 27
  4. 36
  5. 56
  6. 16
  7. 10
  8. Monday
  9. 9
  10. Sunday
  11. 999
  12. 24
  13. 80
  14. 120
  15. 10
  16. 6
  17. 43
  18. 4
  19. 30
  20. 9
  21. 62
  22. 1089
  23. 10
  24. 23
  25. 12
  26. 222
  27. 5050
  28. 6660
  29. 792
  30. 9
  31. 34000
  32. 1400
  33. 45
  34. 7
  35. Thursday
  36. 0
  37. 693
  38. 110
  39. 14
  40. 36

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