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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 563 · 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. 1.51 × 4 =
  2. 2.You have 12 coins. Each coin is ₹1 or ₹2, and together they make ₹16. How many ₹2 coins do you have?
  3. 3.9 × 7 = 6? — what is the missing digit?
  4. 4.9 × 10 =
  5. 5.891 + 198 =
  6. 6.12 × 8 + 2 =
  7. 7.1 + 2 + 3 + … + 89 =
  8. 8.What comes next? 4, 11, 18, 25, ? (a) 32 (b) 39 (c) 25 (d) 33
  9. 9.Magic square (every row, column and diagonal has the same total): 6 11 10 | 13 9 ? | 8 7 12. What is the missing number?
  10. 10.What comes next? 13, 21, 29, 37, ? (a) 45 (b) 53 (c) 46 (d) 37
  11. 11.3 × 9 =
  12. 12.What comes next? 5, 10, 20, 40, ? (a) 70 (b) 81 (c) 60 (d) 80
  13. 13.9 × 4 = 3? — what is the missing digit?
  14. 14.36 × 4 =
  15. 15.9 × 3 =
  16. 16.Magic trick! Think of 17. Double it, add 14, halve it, then take away 17. What number do you get?
  17. 17.53 × 4 =
  18. 18.Magic square (every row, column and diagonal has the same total): 17 19 9 | 7 15 23 | 21 11 ?. What is the missing number?
  19. 19.37 × 3 =
  20. 20.12345679 × 9 =
  21. 21.111111 × 111111 =
  22. 22.A father is 35 years old and his son is 9. How old was the father when the son was born?
  23. 23.The ages of two twins add up to 26. How old is each twin?
  24. 24.The 1st of a month is a Monday. What day is the 19th of the same month? (a) Saturday (b) Friday (c) Thursday (d) Monday
  25. 25.In 3 years a boy will be 15 years old. How old was he 4 years ago?
  26. 26.9 × 7 = ?3 — what is the missing digit?
  27. 27.What comes next? 4, 8, 16, 32, ? (a) 48 (b) 65 (c) 56 (d) 64
  28. 28.9 × 9 = ?1 — what is the missing digit?
  29. 29.If today is Monday, what day will it be after 12 days? (a) Tuesday (b) Saturday (c) Friday (d) Sunday
  30. 30.22 × 4 =
  31. 31.?628 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.A girl is 11 years old and her brother is 2 years older. How old will her brother be in 2 years?
  33. 33.Half of 122 =
  34. 34.4 × 9 =
  35. 35.If today is Sunday, what day will it be after 66 days? (a) Saturday (b) Thursday (c) Wednesday (d) Tuesday
  36. 36.12345679 × 36 =
  37. 37.Magic square (every row, column and diagonal has the same total): 15 ? 7 | 5 13 21 | 19 9 11. What is the missing number?
  38. 38.I thought of a number, added 3 and then doubled it. I got 18. What was my number?
  39. 39.Double 97 =
  40. 40.679? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

  1. 204
  2. 4
  3. 3
  4. 90
  5. 1089
  6. 98
  7. 4005
  8. 32
  9. 5
  10. 45
  11. 27
  12. 80
  13. 6
  14. 144
  15. 27
  16. 7
  17. 212
  18. 13
  19. 111
  20. 111111111
  21. 12345654321
  22. 26
  23. 13
  24. Friday
  25. 8
  26. 6
  27. 64
  28. 8
  29. Saturday
  30. 88
  31. 2
  32. 15
  33. 61
  34. 36
  35. Wednesday
  36. 444444444
  37. 17
  38. 6
  39. 194
  40. 5

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