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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 803 · 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.Magic square (every row, column and diagonal has the same total): 19 16 31 | 34 22 ? | 13 28 25. What is the missing number?
  2. 2.4 × 9 =
  3. 3.16?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.You have 15 coins. Each coin is ₹1 or ₹2, and together they make ₹17. How many ₹2 coins do you have?
  5. 5.9 × 10 = ?0 — what is the missing digit?
  6. 6.61 × ? = 6100
  7. 7.30 × 4 =
  8. 8.Magic square (every row, column and diagonal has the same total): 12 27 24 | 33 21 9 | 18 ? 30. What is the missing number?
  9. 9.Half of 26 =
  10. 10.Magic square (every row, column and diagonal has the same total): 4 ? 2 | 3 5 7 | 8 1 6. What is the missing number?
  11. 11.20 × 100 =
  12. 12.9 × 9 = ?1 — what is the missing digit?
  13. 13.Take 51 and take away the sum of its digits. What do you get?
  14. 14.A girl is 12 years old and her brother is 3 years older. How old will her brother be in 5 years?
  15. 15.15 × ? = 15000
  16. 16.I thought of a number, multiplied it by 4 and added 7. I got 43. What was my number?
  17. 17.9 × 4 = 3? — what is the missing digit?
  18. 18.Take 28 and take away the sum of its digits. What do you get?
  19. 19.You have 15 coins. Each coin is ₹1 or ₹2, and together they make ₹21. How many ₹2 coins do you have?
  20. 20.Do the 1089 trick with 491: reverse and subtract, then reverse that answer and add. What do you get?
  21. 21.The ages of two twins add up to 24. How old is each twin?
  22. 22.111 × 111 =
  23. 23.18 × ? = 18000
  24. 24.1 + 2 + 3 + … + 38 =
  25. 25.Magic square (every row, column and diagonal has the same total): 9 4 11 | 10 ? 6 | 5 12 7. What is the missing number?
  26. 26.If today is Thursday, what day was it 37 days ago? (a) Monday (b) Wednesday (c) Friday (d) Tuesday
  27. 27.9 × 9 =
  28. 28.Take 34 and take away the sum of its digits. What do you get?
  29. 29.9 × 9 = 8? — what is the missing digit?
  30. 30.9 × 1 =
  31. 31.1234567 × 9 + 8 =
  32. 32.9 × 2 = 1? — what is the missing digit?
  33. 33.9 × 4 =
  34. 34.876? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.3?98 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.297 + 792 =
  37. 37.I thought of a number, added 8 and then doubled it. I got 32. What was my number?
  38. 38.1 + 2 + 3 + … + 73 =
  39. 39.1 × 9 =
  40. 40.Take 960. Reverse its digits and take the smaller number away from the bigger one. What do you get?

Answer key

  1. 10
  2. 36
  3. 9
  4. 2
  5. 9
  6. 100
  7. 120
  8. 15
  9. 13
  10. 9
  11. 2000
  12. 8
  13. 45
  14. 20
  15. 1000
  16. 9
  17. 6
  18. 18
  19. 6
  20. 1089
  21. 12
  22. 12321
  23. 1000
  24. 741
  25. 8
  26. Tuesday
  27. 81
  28. 27
  29. 1
  30. 9
  31. 11111111
  32. 8
  33. 36
  34. 6
  35. 7
  36. 1089
  37. 8
  38. 2701
  39. 9
  40. 891

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