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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 208 · 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. 1.9 × 2 =
  2. 2.1 + 2 + 3 + … + 90 =
  3. 3.9 × 4 =
  4. 4.568 × 10 =
  5. 5.48 × 4 =
  6. 6.?226 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.72 × ? = 7200
  8. 8.9 × 6 =
  9. 9.5 × 9 =
  10. 10.I thought of a number, added 2 and then doubled it. I got 20. What was my number?
  11. 11.What comes next? 5, 11, 17, 23, ? (a) 30 (b) 23 (c) 29 (d) 35
  12. 12.10 × 9 =
  13. 13.Half of 134 =
  14. 14.660 × ? = 6600
  15. 15.1234567 × 8 + 7 =
  16. 16.9 × 2 = ?8 — what is the missing digit?
  17. 17.9 × 9 = 8? — what is the missing digit?
  18. 18.If today is Tuesday, what day will it be after 85 days? (a) Saturday (b) Tuesday (c) Thursday (d) Wednesday
  19. 19.If today is Thursday, what day was it 13 days ago? (a) Monday (b) Saturday (c) Thursday (d) Friday
  20. 20.What comes next? 4, 9, 16, 25, ? (a) 38 (b) 36 (c) 34 (d) 37
  21. 21.The 5th of a month is a Monday. What day is the 30th of the same month? (a) Friday (b) Saturday (c) Thursday (d) Monday
  22. 22.30 × ? = 3000
  23. 23.What comes next? 19, 22, 25, 28, ? (a) 31 (b) 34 (c) 28 (d) 32
  24. 24.I thought of a number, multiplied it by 3 and added 9. I got 27. What was my number?
  25. 25.Magic square (every row, column and diagonal has the same total): ? 12 5 | 6 8 10 | 11 4 9. What is the missing number?
  26. 26.What comes next? 16, 25, 36, 49, ? (a) 62 (b) 64 (c) 65 (d) 66
  27. 27.Magic square (every row, column and diagonal has the same total): ? 10 15 | 16 12 8 | 9 14 13. What is the missing number?
  28. 28.Magic square (every row, column and diagonal has the same total): 9 10 5 | 4 8 12 | 11 6 ?. What is the missing number?
  29. 29.9 × 9 = ?1 — what is the missing digit?
  30. 30.123 × 8 + 3 =
  31. 31.Magic square (every row, column and diagonal has the same total): 12 ? 6 | 9 15 21 | 24 3 18. What is the missing number?
  32. 32.1 + 3 + 5 + … + 23 =
  33. 33.20 × 4 =
  34. 34.37 × 27 =
  35. 35.You have 14 coins. Each coin is ₹1 or ₹2, and together they make ₹26. How many ₹2 coins do you have?
  36. 36.A father is 36 years old and his son is 5. How old was the father when the son was born?
  37. 37.If today is Friday, what day will it be after 66 days? (a) Tuesday (b) Thursday (c) Sunday (d) Monday
  38. 38.What comes next? 13, 22, 31, 40, ? (a) 50 (b) 58 (c) 40 (d) 49
  39. 39.Magic square (every row, column and diagonal has the same total): 7 8 3 | 2 6 10 | ? 4 5. What is the missing number?
  40. 40.Think of 5. Multiply it by 4, then add 1. What number do you end with?

Answer key

  1. 18
  2. 4095
  3. 36
  4. 5680
  5. 192
  6. 8
  7. 100
  8. 54
  9. 45
  10. 8
  11. 29
  12. 90
  13. 67
  14. 10
  15. 9876543
  16. 1
  17. 1
  18. Wednesday
  19. Friday
  20. 36
  21. Friday
  22. 100
  23. 31
  24. 6
  25. 7
  26. 64
  27. 11
  28. 7
  29. 8
  30. 987
  31. 27
  32. 144
  33. 80
  34. 999
  35. 12
  36. 31
  37. Monday
  38. 49
  39. 9
  40. 21

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