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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 378 · 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.The ages of two twins add up to 26. How old is each twin?
  2. 2.Half of 154 =
  3. 3.4 × 9 =
  4. 4.Magic trick! Think of 15. Double it, add 4, halve it, then take away 15. What number do you get?
  5. 5.9 × 8 =
  6. 6.Half of 52 =
  7. 7.Half of 12 =
  8. 8.Magic square (every row, column and diagonal has the same total): 21 23 13 | 11 ? 27 | 25 15 17. What is the missing number?
  9. 9.9 × 8 = 7? — what is the missing digit?
  10. 10.Think of 13. Multiply it by 3, then add 8. What number do you end with?
  11. 11.Magic square (every row, column and diagonal has the same total): 26 5 20 | 11 17 23 | ? 29 8. What is the missing number?
  12. 12.Magic square (every row, column and diagonal has the same total): ? 11 4 | 5 7 9 | 10 3 8. What is the missing number?
  13. 13.594 + 495 =
  14. 14.26 × 4 =
  15. 15.You have 14 coins. Each coin is ₹1 or ₹2, and together they make ₹17. How many ₹2 coins do you have?
  16. 16.12345679 × 81 =
  17. 17.Double 73 =
  18. 18.1 + 3 + 5 + … + 23 =
  19. 19.A father is 39 years old and his son is 13. How old was the father when the son was born?
  20. 20.37 × 100 =
  21. 21.22 × 4 =
  22. 22.Half of 194 =
  23. 23.37 × 4 =
  24. 24.7 × 4 =
  25. 25.The ages of two twins add up to 14. How old is each twin?
  26. 26.37 × 9 =
  27. 27.12345679 × 72 =
  28. 28.9 × 3 = ?7 — what is the missing digit?
  29. 29.39 × ? = 39000
  30. 30.A girl is 7 years old and her brother is 6 years older. How old will her brother be in 4 years?
  31. 31.9 × 9 = 8? — what is the missing digit?
  32. 32.9 × 5 =
  33. 33.1234567 × 9 + 8 =
  34. 34.A girl is 6 years old and her brother is 6 years older. How old will her brother be in 7 years?
  35. 35.9 × 10 = ?0 — what is the missing digit?
  36. 36.If today is Sunday, what day was it 45 days ago? (a) Sunday (b) Thursday (c) Wednesday (d) Friday
  37. 37.1 + 3 + 5 + … + 9 =
  38. 38.Magic square (every row, column and diagonal has the same total): 21 24 9 | 6 18 30 | ? 12 15. What is the missing number?
  39. 39.Magic square (every row, column and diagonal has the same total): 6 1 8 | ? 5 3 | 2 9 4. What is the missing number?
  40. 40.A piggy bank has 4 coins of ₹5 and 3 coins of ₹2. How many rupees are in it?

Answer key

  1. 13
  2. 77
  3. 36
  4. 2
  5. 72
  6. 26
  7. 6
  8. 19
  9. 2
  10. 47
  11. 14
  12. 6
  13. 1089
  14. 104
  15. 3
  16. 999999999
  17. 146
  18. 144
  19. 26
  20. 3700
  21. 88
  22. 97
  23. 148
  24. 28
  25. 7
  26. 333
  27. 888888888
  28. 2
  29. 1000
  30. 17
  31. 1
  32. 45
  33. 11111111
  34. 19
  35. 9
  36. Thursday
  37. 25
  38. 27
  39. 7
  40. 26

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