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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 529 · 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.If today is Wednesday, what day will it be after 21 days? (a) Wednesday (b) Thursday (c) Tuesday (d) Saturday
  2. 2.9 × 8 = ?2 — what is the missing digit?
  3. 3.54 × 4 =
  4. 4.What comes next? 5, 10, 20, 40, ? (a) 60 (b) 70 (c) 80 (d) 81
  5. 5.4?74 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.9 × 9 = ?1 — what is the missing digit?
  7. 7.I thought of a number, added 2 and then doubled it. I got 36. What was my number?
  8. 8.Think of 10. Multiply it by 2, then add 6. What number do you end with?
  9. 9.Magic square (every row, column and diagonal has the same total): 10 31 16 | 25 19 ? | 22 7 28. What is the missing number?
  10. 10.12345679 × 81 =
  11. 11.1 × 9 =
  12. 12.A piggy bank has 9 coins of ₹5 and 7 coins of ₹2. How many rupees are in it?
  13. 13.Take 900. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  14. 14.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
  15. 15.5 × 9 =
  16. 16.12345679 × 54 =
  17. 17.54?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.4 × ? = 40
  19. 19.Think of 7. Multiply it by 2, then add 5. What number do you end with?
  20. 20.8 × 9 =
  21. 21.10 × 100 =
  22. 22.What comes next? 16, 21, 26, 31, ? (a) 31 (b) 41 (c) 36 (d) 37
  23. 23.792 + 297 =
  24. 24.The 5th of a month is a Wednesday. What day is the 15th of the same month? (a) Tuesday (b) Sunday (c) Saturday (d) Friday
  25. 25.16 × 4 =
  26. 26.Magic square (every row, column and diagonal has the same total): 18 4 14 | 8 12 16 | ? 20 6. What is the missing number?
  27. 27.9 × 9 = 8? — what is the missing digit?
  28. 28.9 × 2 = ?8 — what is the missing digit?
  29. 29.Half of 48 =
  30. 30.Magic square (every row, column and diagonal has the same total): 17 7 9 | ? 11 19 | 13 15 5. What is the missing number?
  31. 31.9 × 6 = ?4 — what is the missing digit?
  32. 32.39 × 1000 =
  33. 33.I thought of a number, added 3 and then doubled it. I got 28. What was my number?
  34. 34.Odd one out: which number is NOT in the 5 times table? (a) 20 (b) 10 (c) 15 (d) 18
  35. 35.Do the 1089 trick with 258: reverse and subtract, then reverse that answer and add. What do you get?
  36. 36.9 × 4 =
  37. 37.1 + 2 + 3 + … + 76 =
  38. 38.353 × 10 =
  39. 39.A girl is 10 years old and her brother is 6 years older. How old will her brother be in 9 years?
  40. 40.What comes next? 11, 19, 27, 35, ? (a) 51 (b) 43 (c) 44 (d) 35

Answer key

  1. Wednesday
  2. 7
  3. 216
  4. 80
  5. 3
  6. 8
  7. 16
  8. 26
  9. 13
  10. 999999999
  11. 9
  12. 59
  13. 891
  14. 495
  15. 45
  16. 666666666
  17. 1
  18. 10
  19. 19
  20. 72
  21. 1000
  22. 36
  23. 1089
  24. Saturday
  25. 64
  26. 10
  27. 1
  28. 1
  29. 24
  30. 3
  31. 5
  32. 39000
  33. 11
  34. 18
  35. 1089
  36. 36
  37. 2926
  38. 3530
  39. 25
  40. 43

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