← Mixed trick challenge lesson New set →

Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 587 · 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 + … + 23 =
  2. 2.Take 620. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  3. 3.Half of 144 =
  4. 4.1 + 3 + 5 + … + 27 =
  5. 5.1 + 2 + 3 + … + 80 =
  6. 6.You have 6 coins. Each coin is ₹1 or ₹2, and together they make ₹8. How many ₹2 coins do you have?
  7. 7.?311 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.Double 26 =
  9. 9.1 + 2 + 3 + … + 12 =
  10. 10.Magic square (every row, column and diagonal has the same total): ? 9 19 | 13 17 21 | 15 25 11. What is the missing number?
  11. 11.Double 82 =
  12. 12.Magic square (every row, column and diagonal has the same total): 26 ? 20 | 11 17 23 | 14 29 8. What is the missing number?
  13. 13.Take 45 and take away the sum of its digits. What do you get?
  14. 14.If today is Saturday, what day was it 40 days ago? (a) Thursday (b) Sunday (c) Tuesday (d) Monday
  15. 15.9 × 8 = ?2 — what is the missing digit?
  16. 16.23 × 4 =
  17. 17.816 × ? = 8160
  18. 18.Double 21 =
  19. 19.1 + 2 + 3 + … + 45 =
  20. 20.1234567 × 8 + 7 =
  21. 21.?856 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.9 × 9 = ?1 — what is the missing digit?
  23. 23.6 × 4 =
  24. 24.37 × 4 =
  25. 25.11? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Magic square (every row, column and diagonal has the same total): 16 2 12 | 6 10 14 | ? 18 4. What is the missing number?
  27. 27.Do the 1089 trick with 940: reverse and subtract, then reverse that answer and add. What do you get?
  28. 28.In 3 years a boy will be 15 years old. How old was he 2 years ago?
  29. 29.65?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.399 × 10 =
  31. 31.A father is 44 years old and his son is 14. How old was the father when the son was born?
  32. 32.Double 17 =
  33. 33.9 × 8 =
  34. 34.53 × 4 =
  35. 35.I thought of a number, added 1 and then doubled it. I got 28. What was my number?
  36. 36.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  37. 37.37 × 18 =
  38. 38.Magic square (every row, column and diagonal has the same total): 8 9 ? | 3 7 11 | 10 5 6. What is the missing number?
  39. 39.?070 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.If today is Monday, what day was it 31 days ago? (a) Monday (b) Thursday (c) Friday (d) Saturday

Answer key

  1. 144
  2. 594
  3. 72
  4. 196
  5. 3240
  6. 2
  7. 4
  8. 52
  9. 78
  10. 23
  11. 164
  12. 5
  13. 36
  14. Monday
  15. 7
  16. 92
  17. 10
  18. 42
  19. 1035
  20. 9876543
  21. 8
  22. 8
  23. 24
  24. 148
  25. 7
  26. 8
  27. 1089
  28. 10
  29. 7
  30. 3990
  31. 30
  32. 34
  33. 72
  34. 212
  35. 13
  36. 693
  37. 666
  38. 4
  39. 2
  40. Friday

Free maths tricks lessons, practice and worksheets at talentjr.in/maths-tricks