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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 13 · 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 × 3 =
  2. 2.Magic square (every row, column and diagonal has the same total): ? 17 20 | 11 23 35 | 26 29 14. What is the missing number?
  3. 3.Magic square (every row, column and diagonal has the same total): 14 ? 12 | 9 11 13 | 10 15 8. What is the missing number?
  4. 4.Odd one out: which number is NOT in the 7 times table? (a) 21 (b) 42 (c) 56 (d) 27
  5. 5.46 × 4 =
  6. 6.A piggy bank has 2 coins of ₹5 and 13 coins of ₹2. How many rupees are in it?
  7. 7.9 × 4 = ?6 — what is the missing digit?
  8. 8.6 × 9 =
  9. 9.If today is Tuesday, what day will it be after 44 days? (a) Sunday (b) Wednesday (c) Thursday (d) Friday
  10. 10.2 × 9 =
  11. 11.77 × 10 =
  12. 12.?740 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.Magic square (every row, column and diagonal has the same total): 25 10 13 | 4 16 28 | ? 22 7. What is the missing number?
  14. 14.Take 996. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  15. 15.Do the 1089 trick with 944: reverse and subtract, then reverse that answer and add. What do you get?
  16. 16.If today is Saturday, what day will it be after 87 days? (a) Monday (b) Friday (c) Wednesday (d) Tuesday
  17. 17.Take 77 and take away the sum of its digits. What do you get?
  18. 18.9 × 5 =
  19. 19.9 × 10 = 9? — what is the missing digit?
  20. 20.Think of 12. Multiply it by 3, then add 2. What number do you end with?
  21. 21.14 × 4 =
  22. 22.A girl is 5 years old and her brother is 5 years older. How old will her brother be in 3 years?
  23. 23.12345679 × 9 =
  24. 24.You have 6 coins. Each coin is ₹1 or ₹2, and together they make ₹7. How many ₹2 coins do you have?
  25. 25.1234567 × 8 + 7 =
  26. 26.9 × 10 = ?0 — what is the missing digit?
  27. 27.Magic trick! Think of 5. Double it, add 12, halve it, then take away 5. What number do you get?
  28. 28.A piggy bank has 3 coins of ₹5 and 5 coins of ₹2. How many rupees are in it?
  29. 29.891 + 198 =
  30. 30.If today is Monday, what day will it be after 22 days? (a) Wednesday (b) Monday (c) Friday (d) Tuesday
  31. 31.In 5 years a boy will be 17 years old. How old was he 5 years ago?
  32. 32.Magic square (every row, column and diagonal has the same total): 18 4 ? | 8 12 16 | 10 20 6. What is the missing number?
  33. 33.Half of 188 =
  34. 34.8 × ? = 8000
  35. 35.9 × 2 = 1? — what is the missing digit?
  36. 36.Magic square (every row, column and diagonal has the same total): 14 4 18 | 16 12 8 | 6 20 ?. What is the missing number?
  37. 37.Half of 24 =
  38. 38.5 × 9 =
  39. 39.Magic square (every row, column and diagonal has the same total): 12 ? 24 | 33 21 9 | 18 15 30. What is the missing number?
  40. 40.3 × 9 =

Answer key

  1. 27
  2. 32
  3. 7
  4. 27
  5. 184
  6. 36
  7. 3
  8. 54
  9. Thursday
  10. 18
  11. 770
  12. 7
  13. 19
  14. 297
  15. 1089
  16. Tuesday
  17. 63
  18. 45
  19. 0
  20. 38
  21. 56
  22. 13
  23. 111111111
  24. 1
  25. 9876543
  26. 9
  27. 6
  28. 25
  29. 1089
  30. Tuesday
  31. 7
  32. 14
  33. 94
  34. 1000
  35. 8
  36. 10
  37. 12
  38. 45
  39. 27
  40. 27

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