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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 382 · 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.A father is 42 years old and his son is 5. How old was the father when the son was born?
  2. 2.2 × ? = 2000
  3. 3.288 × ? = 2880
  4. 4.What comes next? 16, 25, 36, 49, ? (a) 65 (b) 64 (c) 62 (d) 66
  5. 5.11 × 1000 =
  6. 6.Odd one out: which number is NOT in the 7 times table? (a) 46 (b) 42 (c) 35 (d) 28
  7. 7.Do the 1089 trick with 740: reverse and subtract, then reverse that answer and add. What do you get?
  8. 8.11 × ? = 1100
  9. 9.9 × 6 = ?4 — what is the missing digit?
  10. 10.Think of 15. Multiply it by 2, then add 1. What number do you end with?
  11. 11.17 × 4 =
  12. 12.Magic square (every row, column and diagonal has the same total): 6 1 8 | ? 5 3 | 2 9 4. What is the missing number?
  13. 13.1 + 2 + 3 + … + 12 =
  14. 14.1 + 2 + 3 + … + 89 =
  15. 15.12345678 × 8 + 8 =
  16. 16.I thought of a number, added 8 and then doubled it. I got 46. What was my number?
  17. 17.You have 11 coins. Each coin is ₹1 or ₹2, and together they make ₹13. How many ₹2 coins do you have?
  18. 18.Magic trick! Think of 19. Double it, add 12, halve it, then take away 19. What number do you get?
  19. 19.9 × 2 = ?8 — what is the missing digit?
  20. 20.Take 44 and take away the sum of its digits. What do you get?
  21. 21.57 × 4 =
  22. 22.2?36 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.9 × 9 = 8? — what is the missing digit?
  24. 24.?244 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.The 7th of a month is a Saturday. What day is the 27th of the same month? (a) Thursday (b) Friday (c) Saturday (d) Monday
  26. 26.Magic trick! Think of 11. Double it, add 8, halve it, then take away 11. What number do you get?
  27. 27.2?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.9 × 9 = ?1 — what is the missing digit?
  29. 29.If today is Tuesday, what day will it be after 60 days? (a) Tuesday (b) Sunday (c) Friday (d) Saturday
  30. 30.53 × 4 =
  31. 31.Take 982. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  32. 32.Double 56 =
  33. 33.You have 6 coins. Each coin is ₹1 or ₹2, and together they make ₹9. How many ₹2 coins do you have?
  34. 34.87?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.43 × 4 =
  36. 36.57?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.?03 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.The 6th of a month is a Wednesday. What day is the 25th of the same month? (a) Sunday (b) Tuesday (c) Monday (d) Thursday
  39. 39.In 6 years a boy will be 19 years old. How old was he 5 years ago?
  40. 40.49 × 4 =

Answer key

  1. 37
  2. 1000
  3. 10
  4. 64
  5. 11000
  6. 46
  7. 1089
  8. 100
  9. 5
  10. 31
  11. 68
  12. 7
  13. 78
  14. 4005
  15. 98765432
  16. 15
  17. 2
  18. 6
  19. 1
  20. 36
  21. 228
  22. 7
  23. 1
  24. 8
  25. Friday
  26. 4
  27. 7
  28. 8
  29. Saturday
  30. 212
  31. 693
  32. 112
  33. 3
  34. 8
  35. 172
  36. 9
  37. 6
  38. Monday
  39. 8
  40. 196

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