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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 999 · 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. 1.9 × 7 =
  2. 2.9 × 8 = ?2 — what is the missing digit?
  3. 3.9 × 8 = 7? — what is the missing digit?
  4. 4.12345679 × 72 =
  5. 5.9 × 4 = 3? — what is the missing digit?
  6. 6.?098 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.43 × ? = 43000
  8. 8.4 × 9 =
  9. 9.36 × 4 =
  10. 10.9 × 4 =
  11. 11.Magic square (every row, column and diagonal has the same total): ? 22 12 | 10 18 26 | 24 14 16. What is the missing number?
  12. 12.10 × 9 =
  13. 13.12 × 8 + 2 =
  14. 14.A father is 38 years old and his son is 9. How old was the father when the son was born?
  15. 15.9 × 10 =
  16. 16.12345679 × 36 =
  17. 17.In 2 years a boy will be 12 years old. How old was he 5 years ago?
  18. 18.Magic square (every row, column and diagonal has the same total): 9 ? 7 | 4 6 8 | 5 10 3. What is the missing number?
  19. 19.1 × 9 =
  20. 20.213 × ? = 2130
  21. 21.Magic square (every row, column and diagonal has the same total): ? 17 12 | 15 13 11 | 14 9 16. What is the missing number?
  22. 22.9 × 3 = ?7 — what is the missing digit?
  23. 23.12345 × 9 + 6 =
  24. 24.804 × 10 =
  25. 25.Magic square (every row, column and diagonal has the same total): 9 14 13 | 16 12 8 | 11 ? 15. What is the missing number?
  26. 26.9 × 9 =
  27. 27.You have 5 coins. Each coin is ₹1 or ₹2, and together they make ₹8. How many ₹2 coins do you have?
  28. 28.You have 7 coins. Each coin is ₹1 or ₹2, and together they make ₹13. How many ₹2 coins do you have?
  29. 29.3?32 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  31. 31.8 × 9 =
  32. 32.Odd one out: which number is NOT in the 5 times table? (a) 20 (b) 25 (c) 35 (d) 18
  33. 33.Take 950. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  34. 34.Half of 166 =
  35. 35.A girl is 8 years old and her brother is 3 years older. How old will her brother be in 6 years?
  36. 36.57 × 4 =
  37. 37.1 + 2 + 3 + … + 50 =
  38. 38.Magic square (every row, column and diagonal has the same total): 13 28 25 | 34 22 10 | ? 16 31. What is the missing number?
  39. 39.9 × 1 =
  40. 40.9 × 6 = ?4 — what is the missing digit?

Answer key

  1. 63
  2. 7
  3. 2
  4. 888888888
  5. 6
  6. 1
  7. 1000
  8. 36
  9. 144
  10. 36
  11. 20
  12. 90
  13. 98
  14. 29
  15. 90
  16. 444444444
  17. 5
  18. 2
  19. 9
  20. 10
  21. 10
  22. 2
  23. 111111
  24. 8040
  25. 10
  26. 81
  27. 3
  28. 6
  29. 1
  30. 297
  31. 72
  32. 18
  33. 891
  34. 83
  35. 17
  36. 228
  37. 1275
  38. 19
  39. 9
  40. 5

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