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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 914 · 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.Take 44 and take away the sum of its digits. What do you get?
  2. 2.19 × 4 =
  3. 3.9 × 3 = 2? — what is the missing digit?
  4. 4.42 × ? = 42000
  5. 5.Take 27 and take away the sum of its digits. What do you get?
  6. 6.9 × 7 = ?3 — what is the missing digit?
  7. 7.Half of 162 =
  8. 8.46 × 4 =
  9. 9.If today is Sunday, what day will it be after 8 days? (a) Thursday (b) Tuesday (c) Sunday (d) Monday
  10. 10.Magic square (every row, column and diagonal has the same total): 14 29 26 | 35 23 11 | ? 17 32. What is the missing number?
  11. 11.Do the 1089 trick with 973: reverse and subtract, then reverse that answer and add. What do you get?
  12. 12.Take 45 and take away the sum of its digits. What do you get?
  13. 13.Double 87 =
  14. 14.9 × 9 = ?1 — what is the missing digit?
  15. 15.Magic trick! Think of 13. Double it, add 6, halve it, then take away 13. What number do you get?
  16. 16.9 × 5 =
  17. 17.111111 × 111111 =
  18. 18.5 × 9 =
  19. 19.Magic square (every row, column and diagonal has the same total): ? 10 3 | 4 6 8 | 9 2 7. What is the missing number?
  20. 20.Magic square (every row, column and diagonal has the same total): 26 11 14 | 5 17 29 | ? 23 8. What is the missing number?
  21. 21.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  22. 22.Double 17 =
  23. 23.11111 × 11111 =
  24. 24.9 × 4 =
  25. 25.A girl is 10 years old and her brother is 5 years older. How old will her brother be in 7 years?
  26. 26.Magic trick! Think of 3. Double it, add 18, halve it, then take away 3. What number do you get?
  27. 27.Magic square (every row, column and diagonal has the same total): 3 8 7 | 10 6 2 | 5 ? 9. What is the missing number?
  28. 28.9 × 8 = ?2 — what is the missing digit?
  29. 29.9 × 9 =
  30. 30.74?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.9 × 10 = 9? — what is the missing digit?
  32. 32.Magic square (every row, column and diagonal has the same total): 14 16 6 | 4 ? 20 | 18 8 10. What is the missing number?
  33. 33.9 × 8 = 7? — what is the missing digit?
  34. 34.The ages of two twins add up to 14. How old is each twin?
  35. 35.9 × 2 = ?8 — what is the missing digit?
  36. 36.95 × 10 =
  37. 37.Do the 1089 trick with 109: reverse and subtract, then reverse that answer and add. What do you get?
  38. 38.758 × 10 =
  39. 39.111 × 111 =
  40. 40.You have 7 coins. Each coin is ₹1 or ₹2, and together they make ₹12. How many ₹2 coins do you have?

Answer key

  1. 36
  2. 76
  3. 7
  4. 1000
  5. 18
  6. 6
  7. 81
  8. 184
  9. Monday
  10. 20
  11. 1089
  12. 36
  13. 174
  14. 8
  15. 3
  16. 45
  17. 12345654321
  18. 45
  19. 5
  20. 20
  21. 693
  22. 34
  23. 123454321
  24. 36
  25. 22
  26. 9
  27. 4
  28. 7
  29. 81
  30. 8
  31. 0
  32. 12
  33. 2
  34. 7
  35. 1
  36. 950
  37. 1089
  38. 7580
  39. 12321
  40. 5

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