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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 965 · 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. 1.7?43 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.47 × 4 =
  3. 3.1 + 3 + 5 + … + 43 =
  4. 4.If today is Sunday, what day was it 19 days ago? (a) Friday (b) Monday (c) Tuesday (d) Wednesday
  5. 5.?586 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.9 × 4 = ?6 — what is the missing digit?
  7. 7.1234 × 8 + 4 =
  8. 8.A father is 33 years old and his son is 5. How old was the father when the son was born?
  9. 9.9 × 3 = ?7 — what is the missing digit?
  10. 10.What comes next? 2, 4, 6, 8, ? (a) 10 (b) 12 (c) 11 (d) 8
  11. 11.10 × 4 =
  12. 12.The ages of two twins add up to 30. How old is each twin?
  13. 13.Half of 152 =
  14. 14.9 × 10 = 9? — what is the missing digit?
  15. 15.1 + 2 + 3 + … + 69 =
  16. 16.Half of 118 =
  17. 17.1234 × 9 + 5 =
  18. 18.9 × 8 = ?2 — what is the missing digit?
  19. 19.The ages of two twins add up to 12. How old is each twin?
  20. 20.1 + 2 + 3 + … + 10 =
  21. 21.895? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.In 3 years a boy will be 12 years old. How old was he 2 years ago?
  23. 23.78 × 100 =
  24. 24.You have 5 coins. Each coin is ₹1 or ₹2, and together they make ₹7. How many ₹2 coins do you have?
  25. 25.Magic square (every row, column and diagonal has the same total): 10 ? 6 | 8 12 16 | 18 4 14. What is the missing number?
  26. 26.Do the 1089 trick with 639: reverse and subtract, then reverse that answer and add. What do you get?
  27. 27.?304 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.1 + 3 + 5 + … + 17 =
  29. 29.12345679 × 9 =
  30. 30.9 × 10 =
  31. 31.If today is Tuesday, what day was it 57 days ago? (a) Monday (b) Tuesday (c) Thursday (d) Sunday
  32. 32.9 × 6 = ?4 — what is the missing digit?
  33. 33.215 × ? = 2150
  34. 34.12 × 4 =
  35. 35.Take 62 and take away the sum of its digits. What do you get?
  36. 36.Odd one out: which number is NOT in the 8 times table? (a) 48 (b) 72 (c) 44 (d) 24
  37. 37.Magic square (every row, column and diagonal has the same total): 11 32 17 | 26 20 14 | 23 ? 29. What is the missing number?
  38. 38.A piggy bank has 11 coins of ₹5 and 3 coins of ₹2. How many rupees are in it?
  39. 39.Double 33 =
  40. 40.You have 14 coins. Each coin is ₹1 or ₹2, and together they make ₹21. How many ₹2 coins do you have?

Answer key

  1. 4
  2. 188
  3. 484
  4. Tuesday
  5. 8
  6. 3
  7. 9876
  8. 28
  9. 2
  10. 10
  11. 40
  12. 15
  13. 76
  14. 0
  15. 2415
  16. 59
  17. 11111
  18. 7
  19. 6
  20. 55
  21. 5
  22. 7
  23. 7800
  24. 2
  25. 20
  26. 1089
  27. 2
  28. 81
  29. 111111111
  30. 90
  31. Monday
  32. 5
  33. 10
  34. 48
  35. 54
  36. 44
  37. 8
  38. 61
  39. 66
  40. 7

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