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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 39 · 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 22. How old is each twin?
  2. 2.891 + 198 =
  3. 3.33 × ? = 33000
  4. 4.Do the 1089 trick with 339: reverse and subtract, then reverse that answer and add. What do you get?
  5. 5.12345679 × 9 =
  6. 6.9 × 8 = ?2 — what is the missing digit?
  7. 7.4 × 9 =
  8. 8.193? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.You have 14 coins. Each coin is ₹1 or ₹2, and together they make ₹26. How many ₹2 coins do you have?
  10. 10.18 × 4 =
  11. 11.If today is Tuesday, what day was it 30 days ago? (a) Sunday (b) Monday (c) Wednesday (d) Saturday
  12. 12.Magic square (every row, column and diagonal has the same total): 28 7 22 | 13 19 25 | ? 31 10. What is the missing number?
  13. 13.9 × 7 = 6? — what is the missing digit?
  14. 14.97 × ? = 9700
  15. 15.26 × 4 =
  16. 16.9 × 4 = ?6 — what is the missing digit?
  17. 17.9 × 7 = ?3 — what is the missing digit?
  18. 18.1 + 2 + 3 + … + 19 =
  19. 19.If today is Friday, what day will it be after 18 days? (a) Tuesday (b) Friday (c) Monday (d) Wednesday
  20. 20.123 × 9 + 4 =
  21. 21.43 × 4 =
  22. 22.Magic square (every row, column and diagonal has the same total): 29 8 23 | 14 20 26 | 17 32 ?. What is the missing number?
  23. 23.?812 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.23 × 4 =
  25. 25.88 × 100 =
  26. 26.Magic square (every row, column and diagonal has the same total): 9 4 5 | ? 6 10 | 7 8 3. What is the missing number?
  27. 27.1 + 2 + 3 + … + 16 =
  28. 28.29 × ? = 29000
  29. 29.If today is Monday, what day was it 32 days ago? (a) Wednesday (b) Sunday (c) Friday (d) Thursday
  30. 30.Take 49 and take away the sum of its digits. What do you get?
  31. 31.693 + 396 =
  32. 32.Magic square (every row, column and diagonal has the same total): 21 24 9 | ? 18 30 | 27 12 15. What is the missing number?
  33. 33.If today is Tuesday, what day was it 8 days ago? (a) Tuesday (b) Thursday (c) Sunday (d) Monday
  34. 34.33 × 4 =
  35. 35.Half of 156 =
  36. 36.55 × 10 =
  37. 37.10 × 4 =
  38. 38.1 + 2 + 3 + … + 28 =
  39. 39.9 × 9 = ?1 — what is the missing digit?
  40. 40.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?

Answer key

  1. 11
  2. 1089
  3. 1000
  4. 1089
  5. 111111111
  6. 7
  7. 36
  8. 5
  9. 12
  10. 72
  11. Sunday
  12. 16
  13. 3
  14. 100
  15. 104
  16. 3
  17. 6
  18. 190
  19. Tuesday
  20. 1111
  21. 172
  22. 11
  23. 7
  24. 92
  25. 8800
  26. 2
  27. 136
  28. 1000
  29. Thursday
  30. 36
  31. 1089
  32. 6
  33. Monday
  34. 132
  35. 78
  36. 550
  37. 40
  38. 406
  39. 8
  40. 198

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