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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 66 · 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. 1.39 × 100 =
  2. 2.78?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.9 × 5 = ?5 — what is the missing digit?
  4. 4.55 × 4 =
  5. 5.?843 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.Double 31 =
  7. 7.35?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.131? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.45 × 1000 =
  10. 10.The 6th of a month is a Wednesday. What day is the 15th of the same month? (a) Thursday (b) Friday (c) Monday (d) Saturday
  11. 11.The 4th of a month is a Tuesday. What day is the 28th of the same month? (a) Thursday (b) Saturday (c) Friday (d) Monday
  12. 12.12?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.Half of 48 =
  14. 14.Magic square (every row, column and diagonal has the same total): 10 3 ? | 5 7 9 | 6 11 4. What is the missing number?
  15. 15.9 × 6 = 5? — what is the missing digit?
  16. 16.693 + 396 =
  17. 17.?809 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.1 + 2 + 3 + … + 75 =
  19. 19.123 × 9 + 4 =
  20. 20.1 × 9 =
  21. 21.48 × 1000 =
  22. 22.Magic square (every row, column and diagonal has the same total): 5 4 ? | 10 6 2 | 3 8 7. What is the missing number?
  23. 23.Double 62 =
  24. 24.9 × 2 = 1? — what is the missing digit?
  25. 25.If today is Monday, what day was it 10 days ago? (a) Friday (b) Thursday (c) Saturday (d) Monday
  26. 26.You have 9 coins. Each coin is ₹1 or ₹2, and together they make ₹12. How many ₹2 coins do you have?
  27. 27.9 × 7 = 6? — what is the missing digit?
  28. 28.The 1st of a month is a Thursday. What day is the 13th of the same month? (a) Wednesday (b) Monday (c) Friday (d) Tuesday
  29. 29.If today is Tuesday, what day will it be after 72 days? (a) Wednesday (b) Sunday (c) Thursday (d) Friday
  30. 30.9 × 10 = ?0 — what is the missing digit?
  31. 31.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
  32. 32.Double 47 =
  33. 33.What comes next? 18, 23, 28, 33, ? (a) 38 (b) 43 (c) 39 (d) 33
  34. 34.Magic square (every row, column and diagonal has the same total): 7 8 3 | ? 6 10 | 9 4 5. What is the missing number?
  35. 35.2?58 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.A girl is 10 years old and her brother is 6 years older. How old will her brother be in 4 years?
  37. 37.If today is Friday, what day will it be after 85 days? (a) Sunday (b) Tuesday (c) Saturday (d) Friday
  38. 38.649? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.1 + 2 + 3 + … + 71 =
  40. 40.Double 33 =

Answer key

  1. 3900
  2. 8
  3. 4
  4. 220
  5. 3
  6. 62
  7. 1
  8. 4
  9. 45000
  10. Friday
  11. Friday
  12. 1
  13. 24
  14. 8
  15. 4
  16. 1089
  17. 1
  18. 2850
  19. 1111
  20. 9
  21. 48000
  22. 9
  23. 124
  24. 8
  25. Friday
  26. 3
  27. 3
  28. Tuesday
  29. Thursday
  30. 9
  31. 594
  32. 94
  33. 38
  34. 2
  35. 3
  36. 20
  37. Saturday
  38. 8
  39. 2556
  40. 66

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