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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 435 · 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 + … + 10 =
  2. 2.1 + 2 + 3 + … + 18 =
  3. 3.If today is Thursday, what day was it 53 days ago? (a) Monday (b) Wednesday (c) Saturday (d) Sunday
  4. 4.385 × ? = 3850
  5. 5.Double 94 =
  6. 6.A father is 39 years old and his son is 5. How old was the father when the son was born?
  7. 7.Double 47 =
  8. 8.24 × 4 =
  9. 9.37 × 21 =
  10. 10.9 × 6 = ?4 — what is the missing digit?
  11. 11.2 × ? = 20
  12. 12.1 + 2 + 3 + … + 73 =
  13. 13.I thought of a number, multiplied it by 4 and added 4. I got 12. What was my number?
  14. 14.What comes next? 4, 9, 16, 25, ? (a) 34 (b) 38 (c) 37 (d) 36
  15. 15.You have 6 coins. Each coin is ₹1 or ₹2, and together they make ₹10. How many ₹2 coins do you have?
  16. 16.25 × 4 =
  17. 17.9 × 5 = 4? — what is the missing digit?
  18. 18.12345679 × 54 =
  19. 19.What comes next? 3, 11, 19, 27, ? (a) 43 (b) 36 (c) 35 (d) 27
  20. 20.8?83 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.3 × 9 =
  22. 22.21 × 1000 =
  23. 23.Magic square (every row, column and diagonal has the same total): 12 7 8 | 5 9 ? | 10 11 6. What is the missing number?
  24. 24.Half of 12 =
  25. 25.If today is Monday, what day was it 53 days ago? (a) Sunday (b) Friday (c) Wednesday (d) Thursday
  26. 26.?406 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.40 × ? = 40000
  28. 28.12345679 × 27 =
  29. 29.If today is Wednesday, what day was it 55 days ago? (a) Wednesday (b) Thursday (c) Sunday (d) Friday
  30. 30.37 × 12 =
  31. 31.Double 19 =
  32. 32.78 × 100 =
  33. 33.1 + 2 + 3 + … + 6 =
  34. 34.What comes next? 3, 6, 12, 24, ? (a) 42 (b) 36 (c) 49 (d) 48
  35. 35.The 1st of a month is a Saturday. What day is the 12th of the same month? (a) Thursday (b) Wednesday (c) Tuesday (d) Saturday
  36. 36.12345 × 8 + 5 =
  37. 37.7 × 9 =
  38. 38.Magic square (every row, column and diagonal has the same total): 13 8 ? | 14 12 10 | 9 16 11. What is the missing number?
  39. 39.I thought of a number, added 5 and then doubled it. I got 32. What was my number?
  40. 40.Double 21 =

Answer key

  1. 55
  2. 171
  3. Sunday
  4. 10
  5. 188
  6. 34
  7. 94
  8. 96
  9. 777
  10. 5
  11. 10
  12. 2701
  13. 2
  14. 36
  15. 4
  16. 100
  17. 5
  18. 666666666
  19. 35
  20. 8
  21. 27
  22. 21000
  23. 13
  24. 6
  25. Thursday
  26. 8
  27. 1000
  28. 333333333
  29. Thursday
  30. 444
  31. 38
  32. 7800
  33. 21
  34. 48
  35. Wednesday
  36. 98765
  37. 63
  38. 15
  39. 11
  40. 42

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