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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 654 · 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.A piggy bank has 5 coins of ₹5 and 11 coins of ₹2. How many rupees are in it?
  2. 2.Take 32 and take away the sum of its digits. What do you get?
  3. 3.43 × 4 =
  4. 4.1234 × 8 + 4 =
  5. 5.Double 42 =
  6. 6.1 + 2 + 3 + … + 14 =
  7. 7.27 × 4 =
  8. 8.Magic square (every row, column and diagonal has the same total): 31 10 ? | 16 22 28 | 19 34 13. What is the missing number?
  9. 9.9 × 10 =
  10. 10.Magic square (every row, column and diagonal has the same total): 31 10 25 | 16 ? 28 | 19 34 13. What is the missing number?
  11. 11.Half of 76 =
  12. 12.A father is 45 years old and his son is 13. How old was the father when the son was born?
  13. 13.2?30 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.396 + 693 =
  15. 15.Think of 2. Multiply it by 5, then add 9. What number do you end with?
  16. 16.In 4 years a boy will be 14 years old. How old was he 3 years ago?
  17. 17.111 × 111 =
  18. 18.9 × 3 = 2? — what is the missing digit?
  19. 19.8 × 9 =
  20. 20.274 × 10 =
  21. 21.12 × 4 =
  22. 22.9 × 1 =
  23. 23.Think of 9. Multiply it by 5, then add 7. What number do you end with?
  24. 24.A girl is 8 years old and her brother is 4 years older. How old will her brother be in 8 years?
  25. 25.Half of 132 =
  26. 26.37 × 24 =
  27. 27.162 × 10 =
  28. 28.7 × 4 =
  29. 29.If today is Saturday, what day will it be after 26 days? (a) Thursday (b) Friday (c) Wednesday (d) Sunday
  30. 30.12345679 × 9 =
  31. 31.Magic square (every row, column and diagonal has the same total): 12 ? 20 | 22 14 6 | 8 18 16. What is the missing number?
  32. 32.What comes next? 4, 9, 16, 25, ? (a) 36 (b) 38 (c) 34 (d) 37
  33. 33.Half of 184 =
  34. 34.What comes next? 5, 10, 20, 40, ? (a) 60 (b) 70 (c) 81 (d) 80
  35. 35.7 × 9 =
  36. 36.Odd one out: which number is NOT in the 9 times table? (a) 36 (b) 85 (c) 45 (d) 27
  37. 37.40 × ? = 40000
  38. 38.9 × 8 =
  39. 39.The 5th of a month is a Wednesday. What day is the 14th of the same month? (a) Saturday (b) Friday (c) Monday (d) Thursday
  40. 40.In 4 years a boy will be 17 years old. How old was he 5 years ago?

Answer key

  1. 47
  2. 27
  3. 172
  4. 9876
  5. 84
  6. 105
  7. 108
  8. 25
  9. 90
  10. 22
  11. 38
  12. 32
  13. 4
  14. 1089
  15. 19
  16. 7
  17. 12321
  18. 7
  19. 72
  20. 2740
  21. 48
  22. 9
  23. 52
  24. 20
  25. 66
  26. 888
  27. 1620
  28. 28
  29. Thursday
  30. 111111111
  31. 10
  32. 36
  33. 92
  34. 80
  35. 63
  36. 85
  37. 1000
  38. 72
  39. Friday
  40. 8

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