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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 15 · 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.What comes next? 17, 26, 35, 44, ? (a) 62 (b) 44 (c) 54 (d) 53
  2. 2.18 × 4 =
  3. 3.The ages of two twins add up to 12. How old is each twin?
  4. 4.The 5th of a month is a Thursday. What day is the 19th of the same month? (a) Sunday (b) Thursday (c) Wednesday (d) Friday
  5. 5.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
  6. 6.704 × 10 =
  7. 7.594 + 495 =
  8. 8.25 × 1000 =
  9. 9.If today is Sunday, what day will it be after 21 days? (a) Wednesday (b) Sunday (c) Monday (d) Saturday
  10. 10.Double 16 =
  11. 11.I thought of a number, multiplied it by 3 and added 4. I got 13. What was my number?
  12. 12.A father is 30 years old and his son is 11. How old was the father when the son was born?
  13. 13.If today is Saturday, what day was it 11 days ago? (a) Wednesday (b) Friday (c) Monday (d) Tuesday
  14. 14.261 × 10 =
  15. 15.Magic square (every row, column and diagonal has the same total): ? 17 7 | 5 13 21 | 19 9 11. What is the missing number?
  16. 16.Magic trick! Think of 10. Double it, add 8, halve it, then take away 10. What number do you get?
  17. 17.Double 76 =
  18. 18.50 × 4 =
  19. 19.You have 14 coins. Each coin is ₹1 or ₹2, and together they make ₹15. How many ₹2 coins do you have?
  20. 20.9 × 3 =
  21. 21.1 + 2 + 3 + … + 54 =
  22. 22.41?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.9 × 7 =
  24. 24.9 × 5 = ?5 — what is the missing digit?
  25. 25.38 × 4 =
  26. 26.A girl is 10 years old and her brother is 2 years older. How old will her brother be in 6 years?
  27. 27.Magic square (every row, column and diagonal has the same total): 20 ? 14 | 17 23 29 | 32 11 26. What is the missing number?
  28. 28.4 × 9 =
  29. 29.Double 32 =
  30. 30.111111 × 111111 =
  31. 31.9 × 10 = ?0 — what is the missing digit?
  32. 32.A girl is 7 years old and her brother is 6 years older. How old will her brother be in 3 years?
  33. 33.Magic square (every row, column and diagonal has the same total): 21 ? 17 | 11 15 19 | 13 23 9. What is the missing number?
  34. 34.Take 41 and take away the sum of its digits. What do you get?
  35. 35.9 × 6 = 5? — what is the missing digit?
  36. 36.If today is Saturday, what day will it be after 85 days? (a) Saturday (b) Sunday (c) Wednesday (d) Monday
  37. 37.I thought of a number, added 3 and then doubled it. I got 28. What was my number?
  38. 38.28 × 4 =
  39. 39.37 × 18 =
  40. 40.11 × 11 =

Answer key

  1. 53
  2. 72
  3. 6
  4. Thursday
  5. 495
  6. 7040
  7. 1089
  8. 25000
  9. Sunday
  10. 32
  11. 3
  12. 19
  13. Tuesday
  14. 2610
  15. 15
  16. 4
  17. 152
  18. 200
  19. 1
  20. 27
  21. 1485
  22. 4
  23. 63
  24. 4
  25. 152
  26. 18
  27. 35
  28. 36
  29. 64
  30. 12345654321
  31. 9
  32. 16
  33. 7
  34. 36
  35. 4
  36. Sunday
  37. 11
  38. 112
  39. 666
  40. 121

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