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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 782 · 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.Half of 114 =
  2. 2.9 × ? = 9000
  3. 3.9 × 7 = ?3 — what is the missing digit?
  4. 4.9 × 1 =
  5. 5.39?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.12 × 1000 =
  7. 7.Half of 142 =
  8. 8.Take 522. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  9. 9.You have 5 coins. Each coin is ₹1 or ₹2, and together they make ₹8. How many ₹2 coins do you have?
  10. 10.37 × 12 =
  11. 11.297 + 792 =
  12. 12.891 + 198 =
  13. 13.29? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.I thought of a number, added 4 and then doubled it. I got 20. What was my number?
  15. 15.What comes next? 1, 4, 9, 16, ? (a) 27 (b) 23 (c) 26 (d) 25
  16. 16.I thought of a number, added 8 and then doubled it. I got 56. What was my number?
  17. 17.You have 7 coins. Each coin is ₹1 or ₹2, and together they make ₹13. How many ₹2 coins do you have?
  18. 18.If today is Thursday, what day was it 58 days ago? (a) Tuesday (b) Wednesday (c) Monday (d) Friday
  19. 19.2 × 9 =
  20. 20.7 × 9 =
  21. 21.9 × 10 =
  22. 22.744 × ? = 7440
  23. 23.A piggy bank has 12 coins of ₹5 and 3 coins of ₹2. How many rupees are in it?
  24. 24.9 × 8 =
  25. 25.What comes next? 6, 11, 16, 21, ? (a) 26 (b) 21 (c) 31 (d) 27
  26. 26.Think of 11. Multiply it by 4, then add 7. What number do you end with?
  27. 27.A father is 38 years old and his son is 14. How old was the father when the son was born?
  28. 28.6 × 4 =
  29. 29.Take 240. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  30. 30.15 × ? = 15000
  31. 31.792 + 297 =
  32. 32.1 + 2 + 3 + … + 26 =
  33. 33.What comes next? 25, 36, 49, 64, ? (a) 83 (b) 81 (c) 82 (d) 79
  34. 34.Magic trick! Think of 17. Double it, add 4, halve it, then take away 17. What number do you get?
  35. 35.A piggy bank has 11 coins of ₹5 and 15 coins of ₹2. How many rupees are in it?
  36. 36.Half of 136 =
  37. 37.3 × 9 =
  38. 38.14 × 4 =
  39. 39.9 × 3 = ?7 — what is the missing digit?
  40. 40.9 × 3 = 2? — what is the missing digit?

Answer key

  1. 57
  2. 1000
  3. 6
  4. 9
  5. 6
  6. 12000
  7. 71
  8. 297
  9. 3
  10. 444
  11. 1089
  12. 1089
  13. 7
  14. 6
  15. 25
  16. 20
  17. 6
  18. Tuesday
  19. 18
  20. 63
  21. 90
  22. 10
  23. 66
  24. 72
  25. 26
  26. 51
  27. 24
  28. 24
  29. 198
  30. 1000
  31. 1089
  32. 351
  33. 81
  34. 2
  35. 85
  36. 68
  37. 27
  38. 56
  39. 2
  40. 7

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