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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 899 · 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. 1.36 × 100 =
  2. 2.6 × 9 =
  3. 3.15 × 4 =
  4. 4.37 × 21 =
  5. 5.297 + 792 =
  6. 6.Take 22 and take away the sum of its digits. What do you get?
  7. 7.A girl is 11 years old and her brother is 4 years older. How old will her brother be in 3 years?
  8. 8.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
  9. 9.9 × 10 = ?0 — what is the missing digit?
  10. 10.A father is 43 years old and his son is 7. How old was the father when the son was born?
  11. 11.9 × 6 =
  12. 12.Magic square (every row, column and diagonal has the same total): 15 10 ? | 16 14 12 | 11 18 13. What is the missing number?
  13. 13.A piggy bank has 12 coins of ₹5 and 5 coins of ₹2. How many rupees are in it?
  14. 14.45 × 4 =
  15. 15.Magic square (every row, column and diagonal has the same total): 13 23 9 | 11 ? 19 | 21 7 17. What is the missing number?
  16. 16.4 × 9 =
  17. 17.1 + 3 + 5 + … + 27 =
  18. 18.Double 76 =
  19. 19.26 × 4 =
  20. 20.1 × 9 =
  21. 21.1 + 3 + 5 + … + 19 =
  22. 22.If today is Sunday, what day will it be after 40 days? (a) Thursday (b) Monday (c) Friday (d) Saturday
  23. 23.1 + 2 + 3 + … + 74 =
  24. 24.In 4 years a boy will be 13 years old. How old was he 5 years ago?
  25. 25.11 × 11 =
  26. 26.Magic square (every row, column and diagonal has the same total): 9 23 ? | 19 15 11 | 17 7 21. What is the missing number?
  27. 27.Magic square (every row, column and diagonal has the same total): 11 ? 15 | 16 12 8 | 9 14 13. What is the missing number?
  28. 28.A girl is 7 years old and her brother is 5 years older. How old will her brother be in 6 years?
  29. 29.2 × 9 =
  30. 30.1 + 3 + 5 + … + 17 =
  31. 31.9 × 10 =
  32. 32.Odd one out: which number is NOT in the 5 times table? (a) 20 (b) 35 (c) 40 (d) 17
  33. 33.1 + 2 + 3 + … + 17 =
  34. 34.111 × 111 =
  35. 35.If today is Wednesday, what day will it be after 84 days? (a) Thursday (b) Saturday (c) Wednesday (d) Tuesday
  36. 36.9 × 9 = ?1 — what is the missing digit?
  37. 37.25 × 4 =
  38. 38.9 × 8 =
  39. 39.Double 21 =
  40. 40.37 × 24 =

Answer key

  1. 3600
  2. 54
  3. 60
  4. 777
  5. 1089
  6. 18
  7. 18
  8. 198
  9. 9
  10. 36
  11. 54
  12. 17
  13. 70
  14. 180
  15. 15
  16. 36
  17. 196
  18. 152
  19. 104
  20. 9
  21. 100
  22. Friday
  23. 2775
  24. 4
  25. 121
  26. 13
  27. 10
  28. 18
  29. 18
  30. 81
  31. 90
  32. 17
  33. 153
  34. 12321
  35. Wednesday
  36. 8
  37. 100
  38. 72
  39. 42
  40. 888

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