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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 584 · 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 + 3 + 5 + … + 27 =
  2. 2.54 × 4 =
  3. 3.A father is 41 years old and his son is 12. How old was the father when the son was born?
  4. 4.In 2 years a boy will be 11 years old. How old was he 3 years ago?
  5. 5.1234567 × 8 + 7 =
  6. 6.If today is Saturday, what day will it be after 32 days? (a) Thursday (b) Tuesday (c) Wednesday (d) Saturday
  7. 7.12345679 × 9 =
  8. 8.I thought of a number, added 8 and then doubled it. I got 42. What was my number?
  9. 9.Think of 2. Multiply it by 5, then add 1. What number do you end with?
  10. 10.The 2nd of a month is a Thursday. What day is the 11th of the same month? (a) Tuesday (b) Friday (c) Sunday (d) Saturday
  11. 11.I thought of a number, multiplied it by 2 and added 8. I got 36. What was my number?
  12. 12.I thought of a number, added 6 and then doubled it. I got 32. What was my number?
  13. 13.What comes next? 9, 16, 25, 36, ? (a) 50 (b) 47 (c) 51 (d) 49
  14. 14.616 × ? = 6160
  15. 15.Magic trick! Think of 9. Double it, add 14, halve it, then take away 9. What number do you get?
  16. 16.Half of 178 =
  17. 17.Magic trick! Think of 9. Double it, add 16, halve it, then take away 9. What number do you get?
  18. 18.1 + 2 + 3 + … + 42 =
  19. 19.1 + 2 + 3 + … + 99 =
  20. 20.569 × 10 =
  21. 21.309 × 10 =
  22. 22.Odd one out: which number is NOT in the 4 times table? (a) 16 (b) 37 (c) 12 (d) 24
  23. 23.46 × 4 =
  24. 24.Take 54 and take away the sum of its digits. What do you get?
  25. 25.Magic square (every row, column and diagonal has the same total): 17 7 21 | 19 15 11 | 9 ? 13. What is the missing number?
  26. 26.A father is 44 years old and his son is 5. How old was the father when the son was born?
  27. 27.Magic square (every row, column and diagonal has the same total): 13 11 21 | 23 15 ? | 9 19 17. What is the missing number?
  28. 28.Magic square (every row, column and diagonal has the same total): 7 14 9 | 12 10 ? | 11 6 13. What is the missing number?
  29. 29.Magic trick! Think of 14. Double it, add 6, halve it, then take away 14. What number do you get?
  30. 30.If today is Saturday, what day was it 52 days ago? (a) Wednesday (b) Tuesday (c) Saturday (d) Thursday
  31. 31.9 × 4 = ?6 — what is the missing digit?
  32. 32.25 × 4 =
  33. 33.42 × 4 =
  34. 34.What comes next? 9, 14, 19, 24, ? (a) 34 (b) 30 (c) 24 (d) 29
  35. 35.Magic trick! Think of 2. Double it, add 10, halve it, then take away 2. What number do you get?
  36. 36.If today is Monday, what day will it be after 59 days? (a) Wednesday (b) Friday (c) Sunday (d) Thursday
  37. 37.Magic square (every row, column and diagonal has the same total): 6 11 4 | 5 7 9 | ? 3 8. What is the missing number?
  38. 38.A piggy bank has 6 coins of ₹5 and 7 coins of ₹2. How many rupees are in it?
  39. 39.10 × 100 =
  40. 40.58 × 4 =

Answer key

  1. 196
  2. 216
  3. 29
  4. 6
  5. 9876543
  6. Wednesday
  7. 111111111
  8. 13
  9. 11
  10. Saturday
  11. 14
  12. 10
  13. 49
  14. 10
  15. 7
  16. 89
  17. 8
  18. 903
  19. 4950
  20. 5690
  21. 3090
  22. 37
  23. 184
  24. 45
  25. 23
  26. 39
  27. 7
  28. 8
  29. 3
  30. Wednesday
  31. 3
  32. 100
  33. 168
  34. 29
  35. 5
  36. Thursday
  37. 10
  38. 44
  39. 1000
  40. 232

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