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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 579 · 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. 1.1 + 3 + 5 + … + 17 =
  2. 2.551 × 10 =
  3. 3.Half of 108 =
  4. 4.What comes next? 9, 16, 25, 36, ? (a) 50 (b) 47 (c) 49 (d) 51
  5. 5.The 1st of a month is a Wednesday. What day is the 28th of the same month? (a) Monday (b) Wednesday (c) Tuesday (d) Friday
  6. 6.21 × 100 =
  7. 7.1 + 3 + 5 + … + 29 =
  8. 8.Magic square (every row, column and diagonal has the same total): 28 ? 22 | 13 19 25 | 16 31 10. What is the missing number?
  9. 9.In 6 years a boy will be 16 years old. How old was he 3 years ago?
  10. 10.I thought of a number, added 2 and then doubled it. I got 36. What was my number?
  11. 11.53 × 4 =
  12. 12.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  13. 13.You have 5 coins. Each coin is ₹1 or ₹2, and together they make ₹9. How many ₹2 coins do you have?
  14. 14.3 × 9 =
  15. 15.23 × 4 =
  16. 16.2 × 9 =
  17. 17.31 × 4 =
  18. 18.1234567 × 9 + 8 =
  19. 19.What comes next? 4, 9, 16, 25, ? (a) 38 (b) 37 (c) 36 (d) 34
  20. 20.1 + 3 + 5 + … + 15 =
  21. 21.9 × 7 =
  22. 22.123456 × 8 + 6 =
  23. 23.I thought of a number, added 8 and then doubled it. I got 32. What was my number?
  24. 24.What comes next? 1, 4, 9, 16, ? (a) 26 (b) 23 (c) 27 (d) 25
  25. 25.94 × 100 =
  26. 26.11111 × 11111 =
  27. 27.301? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.Take 54 and take away the sum of its digits. What do you get?
  29. 29.9 × 10 = 9? — what is the missing digit?
  30. 30.If today is Wednesday, what day will it be after 39 days? (a) Wednesday (b) Saturday (c) Sunday (d) Monday
  31. 31.10 × 9 =
  32. 32.9 × 7 = 6? — what is the missing digit?
  33. 33.9 × 3 = ?7 — what is the missing digit?
  34. 34.1 + 2 + 3 + … + 25 =
  35. 35.26 × 100 =
  36. 36.9 × 7 = ?3 — what is the missing digit?
  37. 37.Double 92 =
  38. 38.9 × 2 =
  39. 39.1 + 2 + 3 + … + 23 =
  40. 40.Odd one out: which number is NOT in the 3 times table? (a) 15 (b) 24 (c) 10 (d) 9

Answer key

  1. 81
  2. 5510
  3. 54
  4. 49
  5. Tuesday
  6. 2100
  7. 225
  8. 7
  9. 7
  10. 16
  11. 212
  12. 297
  13. 4
  14. 27
  15. 92
  16. 18
  17. 124
  18. 11111111
  19. 36
  20. 64
  21. 63
  22. 987654
  23. 8
  24. 25
  25. 9400
  26. 123454321
  27. 5
  28. 45
  29. 0
  30. Sunday
  31. 90
  32. 3
  33. 2
  34. 325
  35. 2600
  36. 6
  37. 184
  38. 18
  39. 276
  40. 10

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