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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 957 · 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.Take 99 and take away the sum of its digits. What do you get?
  2. 2.9 × 5 =
  3. 3.Do the 1089 trick with 720: reverse and subtract, then reverse that answer and add. What do you get?
  4. 4.If today is Monday, what day was it 32 days ago? (a) Friday (b) Sunday (c) Wednesday (d) Thursday
  5. 5.37 × 15 =
  6. 6.74 × ? = 7400
  7. 7.Take 582. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  8. 8.37 × 4 =
  9. 9.What comes next? 13, 18, 23, 28, ? (a) 28 (b) 34 (c) 38 (d) 33
  10. 10.9 × 5 = 4? — what is the missing digit?
  11. 11.9 × 10 = ?0 — what is the missing digit?
  12. 12.If today is Sunday, what day was it 34 days ago? (a) Monday (b) Tuesday (c) Sunday (d) Thursday
  13. 13.9 × 4 = 3? — what is the missing digit?
  14. 14.Take 245. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  15. 15.31 × ? = 31000
  16. 16.15 × 1000 =
  17. 17.A piggy bank has 2 coins of ₹5 and 2 coins of ₹2. How many rupees are in it?
  18. 18.20 × 4 =
  19. 19.Magic square (every row, column and diagonal has the same total): ? 7 6 | 9 5 1 | 4 3 8. What is the missing number?
  20. 20.If today is Sunday, what day will it be after 50 days? (a) Tuesday (b) Thursday (c) Sunday (d) Monday
  21. 21.1 + 2 + 3 + … + 65 =
  22. 22.1 + 2 + 3 + … + 40 =
  23. 23.9 × 2 = ?8 — what is the missing digit?
  24. 24.54 × 4 =
  25. 25.111111 × 111111 =
  26. 26.12345679 × 63 =
  27. 27.3?68 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.32 × ? = 3200
  29. 29.Double 24 =
  30. 30.43 × 4 =
  31. 31.Half of 118 =
  32. 32.40 × 1000 =
  33. 33.Think of 8. Multiply it by 3, then add 2. What number do you end with?
  34. 34.What comes next? 1, 4, 9, 16, ? (a) 27 (b) 26 (c) 25 (d) 23
  35. 35.Double 31 =
  36. 36.Take 52 and take away the sum of its digits. What do you get?
  37. 37.Do the 1089 trick with 370: reverse and subtract, then reverse that answer and add. What do you get?
  38. 38.21 × 4 =
  39. 39.Magic square (every row, column and diagonal has the same total): 10 ? 6 | 5 9 13 | 12 7 8. What is the missing number?
  40. 40.Magic trick! Think of 16. Double it, add 4, halve it, then take away 16. What number do you get?

Answer key

  1. 81
  2. 45
  3. 1089
  4. Thursday
  5. 555
  6. 100
  7. 297
  8. 148
  9. 33
  10. 5
  11. 9
  12. Monday
  13. 6
  14. 297
  15. 1000
  16. 15000
  17. 14
  18. 80
  19. 2
  20. Monday
  21. 2145
  22. 820
  23. 1
  24. 216
  25. 12345654321
  26. 777777777
  27. 1
  28. 100
  29. 48
  30. 172
  31. 59
  32. 40000
  33. 26
  34. 25
  35. 62
  36. 45
  37. 1089
  38. 84
  39. 11
  40. 2

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