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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 786 · 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): 3 ? 5 | 8 6 4 | 7 2 9. What is the missing number?
  2. 2.5 × 9 =
  3. 3.6 × 9 =
  4. 4.Double 86 =
  5. 5.A piggy bank has 4 coins of ₹5 and 11 coins of ₹2. How many rupees are in it?
  6. 6.9 × 8 = 7? — what is the missing digit?
  7. 7.9 × 1000 =
  8. 8.Half of 48 =
  9. 9.9 × 9 = ?1 — what is the missing digit?
  10. 10.12 × 4 =
  11. 11.Double 22 =
  12. 12.31 × 4 =
  13. 13.Think of 4. Multiply it by 5, then add 6. What number do you end with?
  14. 14.5?27 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.297 + 792 =
  16. 16.A father is 41 years old and his son is 4. How old was the father when the son was born?
  17. 17.Double 94 =
  18. 18.380 × 10 =
  19. 19.1 + 2 + 3 + … + 11 =
  20. 20.In 6 years a boy will be 20 years old. How old was he 6 years ago?
  21. 21.Magic trick! Think of 8. Double it, add 18, halve it, then take away 8. What number do you get?
  22. 22.A girl is 12 years old and her brother is 6 years older. How old will her brother be in 2 years?
  23. 23.1 + 2 + 3 + … + 55 =
  24. 24.Think of 12. Multiply it by 2, then add 9. What number do you end with?
  25. 25.What comes next? 1, 4, 9, 16, ? (a) 27 (b) 23 (c) 26 (d) 25
  26. 26.You have 5 coins. Each coin is ₹1 or ₹2, and together they make ₹6. How many ₹2 coins do you have?
  27. 27.If today is Wednesday, what day will it be after 61 days? (a) Tuesday (b) Monday (c) Sunday (d) Thursday
  28. 28.8 × 9 =
  29. 29.9 × 6 =
  30. 30.Take 67 and take away the sum of its digits. What do you get?
  31. 31.111 × 111 =
  32. 32.1 × 9 =
  33. 33.37 × 15 =
  34. 34.2 × 9 =
  35. 35.9 × 5 =
  36. 36.9 × 5 = 4? — what is the missing digit?
  37. 37.In 6 years a boy will be 15 years old. How old was he 2 years ago?
  38. 38.9 × 6 = ?4 — what is the missing digit?
  39. 39.4 × 9 =
  40. 40.1 + 2 + 3 + … + 32 =

Answer key

  1. 10
  2. 45
  3. 54
  4. 172
  5. 42
  6. 2
  7. 9000
  8. 24
  9. 8
  10. 48
  11. 44
  12. 124
  13. 26
  14. 4
  15. 1089
  16. 37
  17. 188
  18. 3800
  19. 66
  20. 8
  21. 9
  22. 20
  23. 1540
  24. 33
  25. 25
  26. 1
  27. Monday
  28. 72
  29. 54
  30. 54
  31. 12321
  32. 9
  33. 555
  34. 18
  35. 45
  36. 5
  37. 7
  38. 5
  39. 36
  40. 528

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