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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 427 · 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. 1.13 × 4 =
  2. 2.43 × 4 =
  3. 3.52 × 4 =
  4. 4.7 × 9 =
  5. 5.2 × 9 =
  6. 6.12345679 × 36 =
  7. 7.Take 500. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  8. 8.I thought of a number, multiplied it by 2 and added 6. I got 14. What was my number?
  9. 9.9 × 4 =
  10. 10.You have 8 coins. Each coin is ₹1 or ₹2, and together they make ₹15. How many ₹2 coins do you have?
  11. 11.1 × 9 =
  12. 12.9 × 2 = 1? — what is the missing digit?
  13. 13.9 × 3 = ?7 — what is the missing digit?
  14. 14.111 × 111 =
  15. 15.12345679 × 45 =
  16. 16.1 + 3 + 5 + … + 9 =
  17. 17.Magic square (every row, column and diagonal has the same total): 14 29 26 | 35 23 11 | 20 ? 32. What is the missing number?
  18. 18.9 × 7 =
  19. 19.You have 13 coins. Each coin is ₹1 or ₹2, and together they make ₹19. How many ₹2 coins do you have?
  20. 20.Do the 1089 trick with 880: reverse and subtract, then reverse that answer and add. What do you get?
  21. 21.12345679 × 63 =
  22. 22.12345679 × 27 =
  23. 23.A father is 43 years old and his son is 14. How old was the father when the son was born?
  24. 24.Do the 1089 trick with 956: reverse and subtract, then reverse that answer and add. What do you get?
  25. 25.Take 69 and take away the sum of its digits. What do you get?
  26. 26.12345 × 9 + 6 =
  27. 27.9 × 5 = 4? — what is the missing digit?
  28. 28.Think of 2. Multiply it by 2, then add 3. What number do you end with?
  29. 29.Magic square (every row, column and diagonal has the same total): 26 5 20 | 11 ? 23 | 14 29 8. What is the missing number?
  30. 30.Double 71 =
  31. 31.9 × 7 = ?3 — what is the missing digit?
  32. 32.?086 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.15 × 4 =
  34. 34.?552 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.9 × 8 = 7? — what is the missing digit?
  36. 36.1 + 3 + 5 + … + 23 =
  37. 37.31 × 4 =
  38. 38.What comes next? 15, 19, 23, 27, ? (a) 35 (b) 27 (c) 32 (d) 31
  39. 39.117 × 10 =
  40. 40.34 × ? = 3400

Answer key

  1. 52
  2. 172
  3. 208
  4. 63
  5. 18
  6. 444444444
  7. 495
  8. 4
  9. 36
  10. 7
  11. 9
  12. 8
  13. 2
  14. 12321
  15. 555555555
  16. 25
  17. 17
  18. 63
  19. 6
  20. 1089
  21. 777777777
  22. 333333333
  23. 29
  24. 1089
  25. 54
  26. 111111
  27. 5
  28. 7
  29. 17
  30. 142
  31. 6
  32. 4
  33. 60
  34. 6
  35. 2
  36. 144
  37. 124
  38. 31
  39. 1170
  40. 100

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