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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 439 · 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. 1.1 + 2 + 3 + … + 66 =
  2. 2.9 × 6 = 5? — what is the missing digit?
  3. 3.1 + 2 + 3 + … + 42 =
  4. 4.Half of 74 =
  5. 5.Magic square (every row, column and diagonal has the same total): 15 ? 19 | 17 13 9 | 7 21 11. What is the missing number?
  6. 6.Take 44 and take away the sum of its digits. What do you get?
  7. 7.Take 739. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  8. 8.Take 20 and take away the sum of its digits. What do you get?
  9. 9.The 1st of a month is a Thursday. What day is the 28th of the same month? (a) Thursday (b) Tuesday (c) Saturday (d) Wednesday
  10. 10.A father is 33 years old and his son is 8. How old was the father when the son was born?
  11. 11.18 × 4 =
  12. 12.9 × 4 = ?6 — what is the missing digit?
  13. 13.1 + 2 + 3 + … + 55 =
  14. 14.Do the 1089 trick with 940: reverse and subtract, then reverse that answer and add. What do you get?
  15. 15.1 + 3 + 5 + … + 17 =
  16. 16.10 × 9 =
  17. 17.A piggy bank has 12 coins of ₹5 and 15 coins of ₹2. How many rupees are in it?
  18. 18.579 × ? = 5790
  19. 19.8?06 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.7?55 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.What comes next? 36, 49, 64, 81, ? (a) 98 (b) 101 (c) 102 (d) 100
  22. 22.A father is 30 years old and his son is 14. How old was the father when the son was born?
  23. 23.What comes next? 9, 16, 25, 36, ? (a) 49 (b) 50 (c) 51 (d) 47
  24. 24.A piggy bank has 5 coins of ₹5 and 2 coins of ₹2. How many rupees are in it?
  25. 25.A father is 45 years old and his son is 11. How old was the father when the son was born?
  26. 26.The 3rd of a month is a Wednesday. What day is the 13th of the same month? (a) Sunday (b) Saturday (c) Tuesday (d) Friday
  27. 27.111 × 111 =
  28. 28.10 × 1000 =
  29. 29.1234567 × 9 + 8 =
  30. 30.If today is Thursday, what day will it be after 29 days? (a) Saturday (b) Monday (c) Friday (d) Thursday
  31. 31.39 × 100 =
  32. 32.Magic trick! Think of 9. Double it, add 12, halve it, then take away 9. What number do you get?
  33. 33.Double 74 =
  34. 34.Magic square (every row, column and diagonal has the same total): 24 10 20 | 14 18 ? | 16 26 12. What is the missing number?
  35. 35.1 + 3 + 5 + … + 43 =
  36. 36.If today is Monday, what day will it be after 21 days? (a) Thursday (b) Tuesday (c) Monday (d) Sunday
  37. 37.Magic square (every row, column and diagonal has the same total): 10 25 22 | 31 19 7 | ? 13 28. What is the missing number?
  38. 38.4 × 9 =
  39. 39.Think of 12. Multiply it by 2, then add 9. What number do you end with?
  40. 40.9 × 7 = 6? — what is the missing digit?

Answer key

  1. 2211
  2. 4
  3. 903
  4. 37
  5. 5
  6. 36
  7. 198
  8. 18
  9. Wednesday
  10. 25
  11. 72
  12. 3
  13. 1540
  14. 1089
  15. 81
  16. 90
  17. 90
  18. 10
  19. 4
  20. 1
  21. 100
  22. 16
  23. 49
  24. 29
  25. 34
  26. Saturday
  27. 12321
  28. 10000
  29. 11111111
  30. Friday
  31. 3900
  32. 6
  33. 148
  34. 22
  35. 484
  36. Monday
  37. 16
  38. 36
  39. 33
  40. 3

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