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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 69 · 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. 1.11111 × 11111 =
  2. 2.9 × 3 = ?7 — what is the missing digit?
  3. 3.8 × 9 =
  4. 4.Take 76 and take away the sum of its digits. What do you get?
  5. 5.60 × 100 =
  6. 6.1?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.1 + 2 + 3 + … + 13 =
  8. 8.9 × 2 =
  9. 9.The 2nd of a month is a Wednesday. What day is the 22nd of the same month? (a) Wednesday (b) Friday (c) Monday (d) Tuesday
  10. 10.A piggy bank has 10 coins of ₹5 and 13 coins of ₹2. How many rupees are in it?
  11. 11.9 × 3 =
  12. 12.Magic square (every row, column and diagonal has the same total): 7 ? 11 | 14 10 6 | 9 8 13. What is the missing number?
  13. 13.12?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.1 + 2 + 3 + … + 54 =
  15. 15.13 × ? = 1300
  16. 16.1 + 3 + 5 + … + 13 =
  17. 17.In 2 years a boy will be 11 years old. How old was he 6 years ago?
  18. 18.5 × 9 =
  19. 19.Magic square (every row, column and diagonal has the same total): 16 26 12 | 14 18 22 | ? 10 20. What is the missing number?
  20. 20.Take 674. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  21. 21.Magic square (every row, column and diagonal has the same total): 8 9 ? | 3 7 11 | 10 5 6. What is the missing number?
  22. 22.Magic square (every row, column and diagonal has the same total): 8 23 20 | 29 17 ? | 14 11 26. What is the missing number?
  23. 23.What comes next? 9, 16, 25, 36, ? (a) 47 (b) 51 (c) 49 (d) 50
  24. 24.9 × 10 =
  25. 25.I thought of a number, added 7 and then doubled it. I got 42. What was my number?
  26. 26.Magic square (every row, column and diagonal has the same total): 20 22 12 | 10 18 26 | 24 14 ?. What is the missing number?
  27. 27.What comes next? 6, 11, 16, 21, ? (a) 26 (b) 21 (c) 31 (d) 27
  28. 28.1 + 3 + 5 + … + 27 =
  29. 29.Take 175. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  30. 30.9 × 8 = 7? — what is the missing digit?
  31. 31.Magic square (every row, column and diagonal has the same total): 6 ? 14 | 20 12 4 | 10 8 18. What is the missing number?
  32. 32.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
  33. 33.62 × 100 =
  34. 34.6?99 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.Double 51 =
  36. 36.If today is Monday, what day will it be after 92 days? (a) Wednesday (b) Friday (c) Monday (d) Tuesday
  37. 37.The 2nd of a month is a Friday. What day is the 28th of the same month? (a) Tuesday (b) Saturday (c) Thursday (d) Wednesday
  38. 38.12 × 4 =
  39. 39.40 × 100 =
  40. 40.Magic square (every row, column and diagonal has the same total): 18 8 ? | 4 12 20 | 14 16 6. What is the missing number?

Answer key

  1. 123454321
  2. 2
  3. 72
  4. 63
  5. 6000
  6. 6
  7. 91
  8. 18
  9. Tuesday
  10. 76
  11. 27
  12. 12
  13. 6
  14. 1485
  15. 100
  16. 49
  17. 3
  18. 45
  19. 24
  20. 198
  21. 4
  22. 5
  23. 49
  24. 90
  25. 14
  26. 16
  27. 26
  28. 196
  29. 396
  30. 2
  31. 16
  32. 891
  33. 6200
  34. 3
  35. 102
  36. Tuesday
  37. Wednesday
  38. 48
  39. 4000
  40. 10

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