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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 673 · 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.A father is 31 years old and his son is 4. How old was the father when the son was born?
  2. 2.9 × 7 = 6? — what is the missing digit?
  3. 3.430? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.Magic square (every row, column and diagonal has the same total): 9 2 7 | 4 6 8 | 5 ? 3. What is the missing number?
  5. 5.I thought of a number, added 6 and then doubled it. I got 26. What was my number?
  6. 6.Half of 12 =
  7. 7.38 × 4 =
  8. 8.What comes next? 7, 9, 11, 13, ? (a) 13 (b) 16 (c) 15 (d) 17
  9. 9.Magic trick! Think of 4. Double it, add 12, halve it, then take away 4. What number do you get?
  10. 10.A father is 31 years old and his son is 14. How old was the father when the son was born?
  11. 11.37 × 18 =
  12. 12.Think of 8. Multiply it by 2, then add 1. What number do you end with?
  13. 13.60 × 4 =
  14. 14.1 + 2 + 3 + … + 30 =
  15. 15.49 × 4 =
  16. 16.1?96 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.If today is Thursday, what day was it 9 days ago? (a) Friday (b) Monday (c) Tuesday (d) Wednesday
  18. 18.Take 810. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  19. 19.Double 71 =
  20. 20.58 × 4 =
  21. 21.Take 67 and take away the sum of its digits. What do you get?
  22. 22.291 × 10 =
  23. 23.The 5th of a month is a Saturday. What day is the 13th of the same month? (a) Wednesday (b) Monday (c) Sunday (d) Saturday
  24. 24.9 × 10 = ?0 — what is the missing digit?
  25. 25.A piggy bank has 11 coins of ₹5 and 14 coins of ₹2. How many rupees are in it?
  26. 26.52 × 4 =
  27. 27.9 × 8 = ?2 — what is the missing digit?
  28. 28.Double 11 =
  29. 29.Odd one out: which number is NOT in the 7 times table? (a) 28 (b) 42 (c) 36 (d) 56
  30. 30.37 × 12 =
  31. 31.If today is Monday, what day will it be after 85 days? (a) Monday (b) Wednesday (c) Tuesday (d) Friday
  32. 32.1234 × 9 + 5 =
  33. 33.A piggy bank has 2 coins of ₹5 and 10 coins of ₹2. How many rupees are in it?
  34. 34.1 + 2 + 3 + … + 60 =
  35. 35.The ages of two twins add up to 14. How old is each twin?
  36. 36.12345 × 9 + 6 =
  37. 37.I thought of a number, multiplied it by 4 and added 9. I got 53. What was my number?
  38. 38.20 × ? = 2000
  39. 39.1 + 2 + 3 + … + 15 =
  40. 40.Think of 12. Multiply it by 5, then add 5. What number do you end with?

Answer key

  1. 27
  2. 3
  3. 2
  4. 10
  5. 7
  6. 6
  7. 152
  8. 15
  9. 6
  10. 17
  11. 666
  12. 17
  13. 240
  14. 465
  15. 196
  16. 2
  17. Tuesday
  18. 792
  19. 142
  20. 232
  21. 54
  22. 2910
  23. Sunday
  24. 9
  25. 83
  26. 208
  27. 7
  28. 22
  29. 36
  30. 444
  31. Tuesday
  32. 11111
  33. 30
  34. 1830
  35. 7
  36. 111111
  37. 11
  38. 100
  39. 120
  40. 65

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