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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 599 · 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.Think of 9. Multiply it by 2, then add 2. What number do you end with?
  2. 2.Do the 1089 trick with 169: reverse and subtract, then reverse that answer and add. What do you get?
  3. 3.9 × 10 = 9? — what is the missing digit?
  4. 4.Magic square (every row, column and diagonal has the same total): ? 17 32 | 35 23 11 | 14 29 26. What is the missing number?
  5. 5.1 + 2 + 3 + … + 87 =
  6. 6.What comes next? 20, 24, 28, 32, ? (a) 32 (b) 36 (c) 40 (d) 37
  7. 7.If today is Tuesday, what day will it be after 59 days? (a) Thursday (b) Saturday (c) Friday (d) Monday
  8. 8.89?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Think of 14. Multiply it by 5, then add 2. What number do you end with?
  10. 10.2 × 1000 =
  11. 11.Double 19 =
  12. 12.Magic square (every row, column and diagonal has the same total): ? 9 16 | 15 13 11 | 10 17 12. What is the missing number?
  13. 13.12345679 × 54 =
  14. 14.A father is 43 years old and his son is 8. How old was the father when the son was born?
  15. 15.Magic square (every row, column and diagonal has the same total): 12 27 24 | 33 ? 9 | 18 15 30. What is the missing number?
  16. 16.24 × 4 =
  17. 17.884 × 10 =
  18. 18.1 + 2 + 3 + … + 16 =
  19. 19.Magic square (every row, column and diagonal has the same total): 21 11 ? | 23 19 15 | 13 27 17. What is the missing number?
  20. 20.9 × 6 =
  21. 21.31 × 4 =
  22. 22.18 × 4 =
  23. 23.1 + 2 + 3 + … + 37 =
  24. 24.1 + 2 + 3 + … + 34 =
  25. 25.You have 5 coins. Each coin is ₹1 or ₹2, and together they make ₹8. How many ₹2 coins do you have?
  26. 26.411 × ? = 4110
  27. 27.Take 39 and take away the sum of its digits. What do you get?
  28. 28.What comes next? 12, 14, 16, 18, ? (a) 18 (b) 20 (c) 22 (d) 21
  29. 29.10 × 9 =
  30. 30.Think of 5. Multiply it by 2, then add 7. What number do you end with?
  31. 31.9 × 2 = 1? — what is the missing digit?
  32. 32.28 × 4 =
  33. 33.661? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.I thought of a number, added 6 and then doubled it. I got 34. What was my number?
  35. 35.Magic square (every row, column and diagonal has the same total): 9 30 15 | 24 18 12 | ? 6 27. What is the missing number?
  36. 36.What comes next? 20, 22, 24, 26, ? (a) 26 (b) 29 (c) 28 (d) 30
  37. 37.If today is Monday, what day was it 42 days ago? (a) Sunday (b) Monday (c) Tuesday (d) Thursday
  38. 38.9 × 9 =
  39. 39.12345679 × 81 =
  40. 40.55 × 4 =

Answer key

  1. 20
  2. 1089
  3. 0
  4. 20
  5. 3828
  6. 36
  7. Friday
  8. 3
  9. 72
  10. 2000
  11. 38
  12. 14
  13. 666666666
  14. 35
  15. 21
  16. 96
  17. 8840
  18. 136
  19. 25
  20. 54
  21. 124
  22. 72
  23. 703
  24. 595
  25. 3
  26. 10
  27. 27
  28. 20
  29. 90
  30. 17
  31. 8
  32. 112
  33. 5
  34. 11
  35. 21
  36. 28
  37. Monday
  38. 81
  39. 999999999
  40. 220

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