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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 455 · 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.?685 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.19 × 1000 =
  3. 3.1 + 3 + 5 + … + 23 =
  4. 4.Take 24 and take away the sum of its digits. What do you get?
  5. 5.1 + 2 + 3 + … + 55 =
  6. 6.631 × 10 =
  7. 7.If today is Monday, what day will it be after 58 days? (a) Saturday (b) Tuesday (c) Wednesday (d) Thursday
  8. 8.What comes next? 25, 36, 49, 64, ? (a) 83 (b) 79 (c) 81 (d) 82
  9. 9.The ages of two twins add up to 28. How old is each twin?
  10. 10.Double 16 =
  11. 11.What comes next? 36, 49, 64, 81, ? (a) 101 (b) 98 (c) 102 (d) 100
  12. 12.12345679 × 72 =
  13. 13.Half of 34 =
  14. 14.1111 × 1111 =
  15. 15.Magic square (every row, column and diagonal has the same total): 15 10 11 | ? 12 16 | 13 14 9. What is the missing number?
  16. 16.19 × 10 =
  17. 17.409 × ? = 4090
  18. 18.99 × 100 =
  19. 19.10 × 4 =
  20. 20.1 + 3 + 5 + … + 33 =
  21. 21.Take 96 and take away the sum of its digits. What do you get?
  22. 22.You have 9 coins. Each coin is ₹1 or ₹2, and together they make ₹15. How many ₹2 coins do you have?
  23. 23.126? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.I thought of a number, multiplied it by 2 and added 8. I got 30. What was my number?
  25. 25.9 × 9 =
  26. 26.891 + 198 =
  27. 27.75 × ? = 7500
  28. 28.9 × 7 = ?3 — what is the missing digit?
  29. 29.43 × 100 =
  30. 30.9 × 7 = 6? — what is the missing digit?
  31. 31.Half of 26 =
  32. 32.9 × 3 = ?7 — what is the missing digit?
  33. 33.1 + 2 + 3 + … + 86 =
  34. 34.Take 94 and take away the sum of its digits. What do you get?
  35. 35.9 × 2 = 1? — what is the missing digit?
  36. 36.1 + 2 + 3 + … + 98 =
  37. 37.10?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.Half of 72 =
  39. 39.40 × 4 =
  40. 40.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?

Answer key

  1. 8
  2. 19000
  3. 144
  4. 18
  5. 1540
  6. 6310
  7. Wednesday
  8. 81
  9. 14
  10. 32
  11. 100
  12. 888888888
  13. 17
  14. 1234321
  15. 8
  16. 190
  17. 10
  18. 9900
  19. 40
  20. 289
  21. 81
  22. 6
  23. 9
  24. 11
  25. 81
  26. 1089
  27. 100
  28. 6
  29. 4300
  30. 3
  31. 13
  32. 2
  33. 3741
  34. 81
  35. 8
  36. 4851
  37. 3
  38. 36
  39. 160
  40. 891

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