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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 806 · 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. 1.4 × 9 =
  2. 2.Odd one out: which number is NOT in the 6 times table? (a) 40 (b) 30 (c) 48 (d) 24
  3. 3.9 × 10 =
  4. 4.37 × 3 =
  5. 5.Double 49 =
  6. 6.Do the 1089 trick with 992: reverse and subtract, then reverse that answer and add. What do you get?
  7. 7.You have 13 coins. Each coin is ₹1 or ₹2, and together they make ₹19. How many ₹2 coins do you have?
  8. 8.Double 41 =
  9. 9.9 × 4 = 3? — what is the missing digit?
  10. 10.Take 16 and take away the sum of its digits. What do you get?
  11. 11.You have 13 coins. Each coin is ₹1 or ₹2, and together they make ₹14. How many ₹2 coins do you have?
  12. 12.You have 6 coins. Each coin is ₹1 or ₹2, and together they make ₹11. How many ₹2 coins do you have?
  13. 13.Think of 5. Multiply it by 3, then add 6. What number do you end with?
  14. 14.Take 51 and take away the sum of its digits. What do you get?
  15. 15.A father is 36 years old and his son is 10. How old was the father when the son was born?
  16. 16.46 × ? = 46000
  17. 17.9 × 10 = ?0 — what is the missing digit?
  18. 18.In 2 years a boy will be 15 years old. How old was he 2 years ago?
  19. 19.98 × 100 =
  20. 20.Magic trick! Think of 5. Double it, add 4, halve it, then take away 5. What number do you get?
  21. 21.2 × 9 =
  22. 22.12345679 × 18 =
  23. 23.6 × 4 =
  24. 24.Magic square (every row, column and diagonal has the same total): 17 32 ? | 14 20 26 | 29 8 23. What is the missing number?
  25. 25.A father is 31 years old and his son is 4. How old was the father when the son was born?
  26. 26.1 + 3 + 5 + … + 45 =
  27. 27.1 + 2 + 3 + … + 60 =
  28. 28.Do the 1089 trick with 653: reverse and subtract, then reverse that answer and add. What do you get?
  29. 29.5 × 1000 =
  30. 30.9 × 3 = 2? — what is the missing digit?
  31. 31.Half of 18 =
  32. 32.9 × 2 = 1? — what is the missing digit?
  33. 33.Double 34 =
  34. 34.21 × 1000 =
  35. 35.If today is Thursday, what day will it be after 71 days? (a) Thursday (b) Monday (c) Friday (d) Saturday
  36. 36.9 × 6 =
  37. 37.Take 760. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  38. 38.6 × ? = 6000
  39. 39.If today is Thursday, what day will it be after 33 days? (a) Monday (b) Tuesday (c) Wednesday (d) Friday
  40. 40.Magic square (every row, column and diagonal has the same total): 17 15 25 | 27 19 ? | 13 23 21. What is the missing number?

Answer key

  1. 36
  2. 40
  3. 90
  4. 111
  5. 98
  6. 1089
  7. 6
  8. 82
  9. 6
  10. 9
  11. 1
  12. 5
  13. 21
  14. 45
  15. 26
  16. 1000
  17. 9
  18. 11
  19. 9800
  20. 2
  21. 18
  22. 222222222
  23. 24
  24. 11
  25. 27
  26. 529
  27. 1830
  28. 1089
  29. 5000
  30. 7
  31. 9
  32. 8
  33. 68
  34. 21000
  35. Friday
  36. 54
  37. 693
  38. 1000
  39. Tuesday
  40. 11

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