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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 182 · 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.The ages of two twins add up to 24. How old is each twin?
  2. 2.I thought of a number, added 4 and then doubled it. I got 34. What was my number?
  3. 3.Double 37 =
  4. 4.A girl is 6 years old and her brother is 6 years older. How old will her brother be in 3 years?
  5. 5.1 + 3 + 5 + … + 25 =
  6. 6.82 × 10 =
  7. 7.9 × 4 = ?6 — what is the missing digit?
  8. 8.Double 11 =
  9. 9.A piggy bank has 5 coins of ₹5 and 11 coins of ₹2. How many rupees are in it?
  10. 10.If today is Tuesday, what day will it be after 40 days? (a) Saturday (b) Wednesday (c) Sunday (d) Monday
  11. 11.Double 38 =
  12. 12.A father is 39 years old and his son is 9. How old was the father when the son was born?
  13. 13.A girl is 8 years old and her brother is 5 years older. How old will her brother be in 3 years?
  14. 14.What comes next? 25, 36, 49, 64, ? (a) 82 (b) 79 (c) 83 (d) 81
  15. 15.1 + 3 + 5 + … + 49 =
  16. 16.If today is Monday, what day was it 41 days ago? (a) Tuesday (b) Friday (c) Monday (d) Wednesday
  17. 17.1 + 3 + 5 + … + 15 =
  18. 18.A father is 35 years old and his son is 9. How old was the father when the son was born?
  19. 19.1 + 2 + 3 + … + 70 =
  20. 20.39 × 4 =
  21. 21.If today is Saturday, what day was it 44 days ago? (a) Sunday (b) Friday (c) Thursday (d) Wednesday
  22. 22.9 × 7 =
  23. 23.Half of 114 =
  24. 24.Take 62 and take away the sum of its digits. What do you get?
  25. 25.What comes next? 16, 25, 36, 49, ? (a) 62 (b) 65 (c) 66 (d) 64
  26. 26.9 × 2 = ?8 — what is the missing digit?
  27. 27.Magic square (every row, column and diagonal has the same total): 11 21 7 | 9 ? 17 | 19 5 15. What is the missing number?
  28. 28.?907 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.I thought of a number, multiplied it by 2 and added 1. I got 5. What was my number?
  30. 30.The 6th of a month is a Sunday. What day is the 30th of the same month? (a) Wednesday (b) Tuesday (c) Thursday (d) Saturday
  31. 31.22 × 100 =
  32. 32.Magic trick! Think of 7. Double it, add 6, halve it, then take away 7. What number do you get?
  33. 33.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  34. 34.Magic square (every row, column and diagonal has the same total): 9 16 11 | 14 12 10 | 13 ? 15. What is the missing number?
  35. 35.The ages of two twins add up to 12. How old is each twin?
  36. 36.5 × 10 =
  37. 37.Take 81 and take away the sum of its digits. What do you get?
  38. 38.Odd one out: which number is NOT in the 3 times table? (a) 16 (b) 21 (c) 15 (d) 9
  39. 39.What comes next? 4, 9, 16, 25, ? (a) 34 (b) 36 (c) 38 (d) 37
  40. 40.14 × 4 =

Answer key

  1. 12
  2. 13
  3. 74
  4. 15
  5. 169
  6. 820
  7. 3
  8. 22
  9. 47
  10. Sunday
  11. 76
  12. 30
  13. 16
  14. 81
  15. 625
  16. Tuesday
  17. 64
  18. 26
  19. 2485
  20. 156
  21. Thursday
  22. 63
  23. 57
  24. 54
  25. 64
  26. 1
  27. 13
  28. 2
  29. 2
  30. Wednesday
  31. 2200
  32. 3
  33. 297
  34. 8
  35. 6
  36. 50
  37. 72
  38. 16
  39. 36
  40. 56

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