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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 992 · 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. 1.3 × 9 =
  2. 2.157 × 10 =
  3. 3.Double 79 =
  4. 4.Take 13 and take away the sum of its digits. What do you get?
  5. 5.9 × 9 =
  6. 6.Magic square (every row, column and diagonal has the same total): 17 7 21 | 19 15 ? | 9 23 13. What is the missing number?
  7. 7.5 × 9 =
  8. 8.8 × 4 =
  9. 9.If today is Wednesday, what day will it be after 26 days? (a) Tuesday (b) Monday (c) Sunday (d) Thursday
  10. 10.9 × 3 =
  11. 11.38 × 1000 =
  12. 12.Do the 1089 trick with 690: reverse and subtract, then reverse that answer and add. What do you get?
  13. 13.297 + 792 =
  14. 14.9 × 10 =
  15. 15.Half of 182 =
  16. 16.9 × 4 = 3? — what is the missing digit?
  17. 17.You have 12 coins. Each coin is ₹1 or ₹2, and together they make ₹22. How many ₹2 coins do you have?
  18. 18.24 × 4 =
  19. 19.I thought of a number, added 6 and then doubled it. I got 44. What was my number?
  20. 20.If today is Friday, what day will it be after 54 days? (a) Thursday (b) Saturday (c) Tuesday (d) Wednesday
  21. 21.37 × 18 =
  22. 22.What comes next? 36, 49, 64, 81, ? (a) 98 (b) 101 (c) 102 (d) 100
  23. 23.Take 811. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  24. 24.50 × 1000 =
  25. 25.If today is Saturday, what day was it 34 days ago? (a) Sunday (b) Saturday (c) Wednesday (d) Monday
  26. 26.If today is Monday, what day was it 35 days ago? (a) Tuesday (b) Thursday (c) Monday (d) Sunday
  27. 27.9 × 2 = 1? — what is the missing digit?
  28. 28.38 × ? = 3800
  29. 29.123456789 × 8 + 9 =
  30. 30.Magic square (every row, column and diagonal has the same total): 10 11 6 | ? 9 13 | 12 7 8. What is the missing number?
  31. 31.Magic square (every row, column and diagonal has the same total): 17 3 13 | 7 11 15 | 9 19 ?. What is the missing number?
  32. 32.11 × 11 =
  33. 33.43 × 4 =
  34. 34.What comes next? 4, 13, 22, 31, ? (a) 49 (b) 41 (c) 31 (d) 40
  35. 35.Do the 1089 trick with 492: reverse and subtract, then reverse that answer and add. What do you get?
  36. 36.11 × 4 =
  37. 37.9 × 2 =
  38. 38.Magic square (every row, column and diagonal has the same total): ? 28 7 | 10 16 22 | 25 4 19. What is the missing number?
  39. 39.Odd one out: which number is NOT in the 4 times table? (a) 24 (b) 36 (c) 31 (d) 16
  40. 40.12345 × 8 + 5 =

Answer key

  1. 27
  2. 1570
  3. 158
  4. 9
  5. 81
  6. 11
  7. 45
  8. 32
  9. Monday
  10. 27
  11. 38000
  12. 1089
  13. 1089
  14. 90
  15. 91
  16. 6
  17. 10
  18. 96
  19. 16
  20. Wednesday
  21. 666
  22. 100
  23. 693
  24. 50000
  25. Sunday
  26. Monday
  27. 8
  28. 100
  29. 987654321
  30. 5
  31. 5
  32. 121
  33. 172
  34. 40
  35. 1089
  36. 44
  37. 18
  38. 13
  39. 31
  40. 98765

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