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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 871 · 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.If today is Friday, what day was it 10 days ago? (a) Friday (b) Wednesday (c) Monday (d) Tuesday
  2. 2.9 × 2 = ?8 — what is the missing digit?
  3. 3.You have 7 coins. Each coin is ₹1 or ₹2, and together they make ₹8. How many ₹2 coins do you have?
  4. 4.9 × 8 = 7? — what is the missing digit?
  5. 5.Think of 2. Multiply it by 2, then add 6. What number do you end with?
  6. 6.37 × 12 =
  7. 7.1234 × 9 + 5 =
  8. 8.7 × 9 =
  9. 9.Take 84 and take away the sum of its digits. What do you get?
  10. 10.370? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.If today is Friday, what day was it 46 days ago? (a) Tuesday (b) Thursday (c) Sunday (d) Monday
  12. 12.A piggy bank has 4 coins of ₹5 and 13 coins of ₹2. How many rupees are in it?
  13. 13.4 × 1000 =
  14. 14.461 × ? = 4610
  15. 15.If today is Wednesday, what day was it 36 days ago? (a) Friday (b) Monday (c) Wednesday (d) Tuesday
  16. 16.177 × 10 =
  17. 17.Do the 1089 trick with 682: reverse and subtract, then reverse that answer and add. What do you get?
  18. 18.Half of 132 =
  19. 19.63 × 100 =
  20. 20.2 × 9 =
  21. 21.Magic trick! Think of 7. Double it, add 14, halve it, then take away 7. What number do you get?
  22. 22.1 + 2 + 3 + … + 75 =
  23. 23.1 + 2 + 3 + … + 52 =
  24. 24.In 3 years a boy will be 13 years old. How old was he 5 years ago?
  25. 25.Half of 112 =
  26. 26.9 × 3 = ?7 — what is the missing digit?
  27. 27.Double 25 =
  28. 28.The 5th of a month is a Wednesday. What day is the 22nd of the same month? (a) Sunday (b) Tuesday (c) Saturday (d) Friday
  29. 29.29 × 1000 =
  30. 30.What comes next? 11, 14, 17, 20, ? (a) 20 (b) 23 (c) 24 (d) 26
  31. 31.Think of 8. Multiply it by 3, then add 9. What number do you end with?
  32. 32.Magic square (every row, column and diagonal has the same total): 4 9 8 | 11 7 3 | ? 5 10. What is the missing number?
  33. 33.25 × 1000 =
  34. 34.56 × 4 =
  35. 35.12 × 4 =
  36. 36.130? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.I thought of a number, multiplied it by 3 and added 5. I got 20. What was my number?
  38. 38.204 × ? = 2040
  39. 39.If today is Friday, what day was it 49 days ago? (a) Monday (b) Thursday (c) Friday (d) Saturday
  40. 40.22 × 4 =

Answer key

  1. Tuesday
  2. 1
  3. 1
  4. 2
  5. 10
  6. 444
  7. 11111
  8. 63
  9. 72
  10. 8
  11. Monday
  12. 46
  13. 4000
  14. 10
  15. Tuesday
  16. 1770
  17. 1089
  18. 66
  19. 6300
  20. 18
  21. 7
  22. 2850
  23. 1378
  24. 5
  25. 56
  26. 2
  27. 50
  28. Saturday
  29. 29000
  30. 23
  31. 33
  32. 6
  33. 25000
  34. 224
  35. 48
  36. 5
  37. 5
  38. 10
  39. Friday
  40. 88

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