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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 668 · 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 10. How old is each twin?
  2. 2.12 × 9 + 3 =
  3. 3.45 × 1000 =
  4. 4.1 + 2 + 3 + … + 71 =
  5. 5.11111 × 11111 =
  6. 6.1234567 × 9 + 8 =
  7. 7.If today is Friday, what day was it 38 days ago? (a) Wednesday (b) Friday (c) Tuesday (d) Monday
  8. 8.123 × 9 + 4 =
  9. 9.I thought of a number, added 1 and then doubled it. I got 8. What was my number?
  10. 10.You have 12 coins. Each coin is ₹1 or ₹2, and together they make ₹16. How many ₹2 coins do you have?
  11. 11.52 × 4 =
  12. 12.Do the 1089 trick with 208: reverse and subtract, then reverse that answer and add. What do you get?
  13. 13.?524 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.Take 720. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  15. 15.37 × 3 =
  16. 16.The 4th of a month is a Thursday. What day is the 26th of the same month? (a) Monday (b) Thursday (c) Saturday (d) Friday
  17. 17.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  18. 18.Half of 192 =
  19. 19.Magic trick! Think of 6. Double it, add 10, halve it, then take away 6. What number do you get?
  20. 20.?766 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.9 × 7 =
  22. 22.If today is Friday, what day will it be after 27 days? (a) Friday (b) Wednesday (c) Thursday (d) Sunday
  23. 23.Magic square (every row, column and diagonal has the same total): 24 9 12 | 3 15 27 | 18 ? 6. What is the missing number?
  24. 24.Half of 164 =
  25. 25.23 × 4 =
  26. 26.66 × 100 =
  27. 27.The ages of two twins add up to 22. How old is each twin?
  28. 28.Magic square (every row, column and diagonal has the same total): 13 14 ? | 8 12 16 | 15 10 11. What is the missing number?
  29. 29.What comes next? 36, 49, 64, 81, ? (a) 98 (b) 102 (c) 100 (d) 101
  30. 30.?916 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.9 × 1 =
  32. 32.I thought of a number, multiplied it by 5 and added 7. I got 67. What was my number?
  33. 33.You have 10 coins. Each coin is ₹1 or ₹2, and together they make ₹19. How many ₹2 coins do you have?
  34. 34.I thought of a number, multiplied it by 5 and added 6. I got 36. What was my number?
  35. 35.Magic square (every row, column and diagonal has the same total): 13 8 9 | 6 ? 14 | 11 12 7. What is the missing number?
  36. 36.9 × 9 =
  37. 37.12345679 × 45 =
  38. 38.Double 66 =
  39. 39.I thought of a number, added 6 and then doubled it. I got 24. What was my number?
  40. 40.Half of 92 =

Answer key

  1. 5
  2. 111
  3. 45000
  4. 2556
  5. 123454321
  6. 11111111
  7. Tuesday
  8. 1111
  9. 3
  10. 4
  11. 208
  12. 1089
  13. 7
  14. 693
  15. 111
  16. Friday
  17. 297
  18. 96
  19. 5
  20. 8
  21. 63
  22. Thursday
  23. 21
  24. 82
  25. 92
  26. 6600
  27. 11
  28. 9
  29. 100
  30. 2
  31. 9
  32. 12
  33. 9
  34. 6
  35. 10
  36. 81
  37. 555555555
  38. 132
  39. 6
  40. 46

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