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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 540 · 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. 1.90 × 100 =
  2. 2.Do the 1089 trick with 118: reverse and subtract, then reverse that answer and add. What do you get?
  3. 3.Do the 1089 trick with 871: reverse and subtract, then reverse that answer and add. What do you get?
  4. 4.Magic square (every row, column and diagonal has the same total): 4 9 ? | 3 5 7 | 8 1 6. What is the missing number?
  5. 5.Take 50 and take away the sum of its digits. What do you get?
  6. 6.37 × 100 =
  7. 7.8 × 4 =
  8. 8.9 × 10 = 9? — what is the missing digit?
  9. 9.9 × 4 =
  10. 10.?878 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.1 + 2 + 3 + … + 41 =
  12. 12.I thought of a number, multiplied it by 2 and added 6. I got 18. What was my number?
  13. 13.9 × 4 = ?6 — what is the missing digit?
  14. 14.925 × 10 =
  15. 15.?22 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.1 + 3 + 5 + … + 15 =
  17. 17.Magic square (every row, column and diagonal has the same total): 9 4 11 | 10 8 6 | ? 12 7. What is the missing number?
  18. 18.40 × 1000 =
  19. 19.60 × 4 =
  20. 20.423 × 10 =
  21. 21.In 2 years a boy will be 11 years old. How old was he 3 years ago?
  22. 22.You have 8 coins. Each coin is ₹1 or ₹2, and together they make ₹15. How many ₹2 coins do you have?
  23. 23.1 + 2 + 3 + … + 42 =
  24. 24.Half of 78 =
  25. 25.9 × 7 = ?3 — what is the missing digit?
  26. 26.1 + 2 + 3 + … + 8 =
  27. 27.1 + 2 + 3 + … + 24 =
  28. 28.Double 25 =
  29. 29.You have 6 coins. Each coin is ₹1 or ₹2, and together they make ₹11. How many ₹2 coins do you have?
  30. 30.Take 266. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  31. 31.9 × 6 =
  32. 32.4?17 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.The 1st of a month is a Tuesday. What day is the 18th of the same month? (a) Friday (b) Monday (c) Thursday (d) Saturday
  34. 34.4 × 9 =
  35. 35.45? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.377? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
  38. 38.13 × 4 =
  39. 39.5 × 9 =
  40. 40.What comes next? 15, 20, 25, 30, ? (a) 35 (b) 36 (c) 40 (d) 30

Answer key

  1. 9000
  2. 1089
  3. 1089
  4. 2
  5. 45
  6. 3700
  7. 32
  8. 0
  9. 36
  10. 4
  11. 861
  12. 6
  13. 3
  14. 9250
  15. 5
  16. 64
  17. 5
  18. 40000
  19. 240
  20. 4230
  21. 6
  22. 7
  23. 903
  24. 39
  25. 6
  26. 36
  27. 300
  28. 50
  29. 5
  30. 396
  31. 54
  32. 6
  33. Friday
  34. 36
  35. 9
  36. 1
  37. 792
  38. 52
  39. 45
  40. 35

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