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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 926 · 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 trick! Think of 12. Double it, add 18, halve it, then take away 12. What number do you get?
  2. 2.9 × 4 =
  3. 3.Take 86 and take away the sum of its digits. What do you get?
  4. 4.What comes next? 1, 4, 9, 16, ? (a) 26 (b) 23 (c) 27 (d) 25
  5. 5.37 × 21 =
  6. 6.Take 51 and take away the sum of its digits. What do you get?
  7. 7.9 × 5 = 4? — what is the missing digit?
  8. 8.What comes next? 18, 24, 30, 36, ? (a) 48 (b) 42 (c) 43 (d) 36
  9. 9.Odd one out: which number is NOT in the 4 times table? (a) 27 (b) 24 (c) 16 (d) 32
  10. 10.9 × 7 = ?3 — what is the missing digit?
  11. 11.Take 610. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  12. 12.22 × 1000 =
  13. 13.If today is Sunday, what day will it be after 93 days? (a) Monday (b) Wednesday (c) Friday (d) Tuesday
  14. 14.If today is Sunday, what day was it 29 days ago? (a) Sunday (b) Friday (c) Tuesday (d) Saturday
  15. 15.The 1st of a month is a Sunday. What day is the 12th of the same month? (a) Wednesday (b) Thursday (c) Sunday (d) Friday
  16. 16.The 1st of a month is a Tuesday. What day is the 29th of the same month? (a) Tuesday (b) Wednesday (c) Friday (d) Monday
  17. 17.2 × 9 =
  18. 18.13 × ? = 1300
  19. 19.396 + 693 =
  20. 20.Magic square (every row, column and diagonal has the same total): 7 12 11 | 14 10 6 | 9 ? 13. What is the missing number?
  21. 21.Half of 18 =
  22. 22.12345679 × 72 =
  23. 23.What comes next? 16, 25, 36, 49, ? (a) 66 (b) 64 (c) 65 (d) 62
  24. 24.123 × 9 + 4 =
  25. 25.Do the 1089 trick with 985: reverse and subtract, then reverse that answer and add. What do you get?
  26. 26.9 × 4 = ?6 — what is the missing digit?
  27. 27.A father is 35 years old and his son is 4. How old was the father when the son was born?
  28. 28.Half of 48 =
  29. 29.If today is Sunday, what day will it be after 19 days? (a) Monday (b) Friday (c) Thursday (d) Saturday
  30. 30.Magic square (every row, column and diagonal has the same total): 11 ? 7 | 6 10 14 | 13 8 9. What is the missing number?
  31. 31.1 + 2 + 3 + … + 59 =
  32. 32.I thought of a number, multiplied it by 4 and added 9. I got 17. What was my number?
  33. 33.I thought of a number, added 5 and then doubled it. I got 28. What was my number?
  34. 34.792 + 297 =
  35. 35.You have 13 coins. Each coin is ₹1 or ₹2, and together they make ₹15. How many ₹2 coins do you have?
  36. 36.37 × 12 =
  37. 37.9 × 2 = 1? — what is the missing digit?
  38. 38.1 + 2 + 3 + … + 33 =
  39. 39.9 × 2 = ?8 — what is the missing digit?
  40. 40.9 × 5 = ?5 — what is the missing digit?

Answer key

  1. 9
  2. 36
  3. 72
  4. 25
  5. 777
  6. 45
  7. 5
  8. 42
  9. 27
  10. 6
  11. 594
  12. 22000
  13. Tuesday
  14. Saturday
  15. Thursday
  16. Tuesday
  17. 18
  18. 100
  19. 1089
  20. 8
  21. 9
  22. 888888888
  23. 64
  24. 1111
  25. 1089
  26. 3
  27. 31
  28. 24
  29. Friday
  30. 12
  31. 1770
  32. 2
  33. 9
  34. 1089
  35. 2
  36. 444
  37. 8
  38. 561
  39. 1
  40. 4

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