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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 903 · 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.You have 7 coins. Each coin is ₹1 or ₹2, and together they make ₹13. How many ₹2 coins do you have?
  2. 2.39 × 100 =
  3. 3.2?32 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.9 × 3 =
  5. 5.Magic square (every row, column and diagonal has the same total): 10 8 18 | 20 ? 4 | 6 16 14. What is the missing number?
  6. 6.12345679 × 45 =
  7. 7.1 + 3 + 5 + … + 47 =
  8. 8.9 × 5 = ?5 — what is the missing digit?
  9. 9.526 × 10 =
  10. 10.50 × 4 =
  11. 11.Take 81 and take away the sum of its digits. What do you get?
  12. 12.1 × 9 =
  13. 13.Double 91 =
  14. 14.Odd one out: which number is NOT in the 4 times table? (a) 16 (b) 10 (c) 32 (d) 20
  15. 15.?48 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.403 × 10 =
  17. 17.In 6 years a boy will be 14 years old. How old was he 7 years ago?
  18. 18.A girl is 7 years old and her brother is 2 years older. How old will her brother be in 7 years?
  19. 19.3 × 9 =
  20. 20.Magic square (every row, column and diagonal has the same total): 8 ? 12 | 15 11 7 | 10 9 14. What is the missing number?
  21. 21.12345679 × 36 =
  22. 22.?263 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.13 × ? = 13000
  24. 24.?241 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.12345679 × 72 =
  26. 26.Magic square (every row, column and diagonal has the same total): 6 ? 8 | 7 5 3 | 2 9 4. What is the missing number?
  27. 27.Do the 1089 trick with 410: reverse and subtract, then reverse that answer and add. What do you get?
  28. 28.9 × 9 = ?1 — what is the missing digit?
  29. 29.9 × 8 =
  30. 30.Magic square (every row, column and diagonal has the same total): 7 ? 15 | 21 13 5 | 11 9 19. What is the missing number?
  31. 31.8?44 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.569 × ? = 5690
  33. 33.17 × 1000 =
  34. 34.39 × 4 =
  35. 35.4 × 9 =
  36. 36.Do the 1089 trick with 674: reverse and subtract, then reverse that answer and add. What do you get?
  37. 37.Think of 2. Multiply it by 5, then add 5. What number do you end with?
  38. 38.1 + 2 + 3 + … + 86 =
  39. 39.197 × 10 =
  40. 40.9 × 1 =

Answer key

  1. 6
  2. 3900
  3. 2
  4. 27
  5. 12
  6. 555555555
  7. 576
  8. 4
  9. 5260
  10. 200
  11. 72
  12. 9
  13. 182
  14. 10
  15. 6
  16. 4030
  17. 1
  18. 16
  19. 27
  20. 13
  21. 444444444
  22. 7
  23. 1000
  24. 2
  25. 888888888
  26. 1
  27. 1089
  28. 8
  29. 72
  30. 17
  31. 2
  32. 10
  33. 17000
  34. 156
  35. 36
  36. 1089
  37. 15
  38. 3741
  39. 1970
  40. 9

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