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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 744 · 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. 1.297 + 792 =
  2. 2.9 × 6 =
  3. 3.55 × 4 =
  4. 4.396 + 693 =
  5. 5.A piggy bank has 4 coins of ₹5 and 2 coins of ₹2. How many rupees are in it?
  6. 6.1 + 2 + 3 + … + 47 =
  7. 7.?800 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.Double 37 =
  9. 9.6 × 4 =
  10. 10.The 6th of a month is a Monday. What day is the 16th of the same month? (a) Sunday (b) Wednesday (c) Thursday (d) Friday
  11. 11.83?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Magic square (every row, column and diagonal has the same total): 13 28 25 | 34 ? 10 | 19 16 31. What is the missing number?
  13. 13.A piggy bank has 7 coins of ₹5 and 5 coins of ₹2. How many rupees are in it?
  14. 14.If today is Saturday, what day will it be after 100 days? (a) Thursday (b) Tuesday (c) Monday (d) Sunday
  15. 15.1 + 3 + 5 + … + 49 =
  16. 16.1 + 2 + 3 + … + 55 =
  17. 17.20 × 1000 =
  18. 18.39 × 4 =
  19. 19.Double 64 =
  20. 20.10 × 4 =
  21. 21.1234567 × 8 + 7 =
  22. 22.Take 790. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  23. 23.Magic trick! Think of 6. Double it, add 8, halve it, then take away 6. What number do you get?
  24. 24.?634 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.9 × 3 = 2? — what is the missing digit?
  26. 26.Odd one out: which number is NOT in the 8 times table? (a) 32 (b) 16 (c) 56 (d) 31
  27. 27.I thought of a number, added 1 and then doubled it. I got 16. What was my number?
  28. 28.28 × 4 =
  29. 29.47 × 4 =
  30. 30.A piggy bank has 9 coins of ₹5 and 13 coins of ₹2. How many rupees are in it?
  31. 31.Do the 1089 trick with 810: reverse and subtract, then reverse that answer and add. What do you get?
  32. 32.Magic square (every row, column and diagonal has the same total): 27 ? 15 | 6 18 30 | 21 24 9. What is the missing number?
  33. 33.2?48 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.Double 52 =
  35. 35.422? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.A father is 43 years old and his son is 13. How old was the father when the son was born?
  37. 37.9 × 6 = ?4 — what is the missing digit?
  38. 38.Think of 6. Multiply it by 5, then add 2. What number do you end with?
  39. 39.Magic square (every row, column and diagonal has the same total): 13 27 17 | 23 19 15 | ? 11 25. What is the missing number?
  40. 40.?611 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

  1. 1089
  2. 54
  3. 220
  4. 1089
  5. 24
  6. 1128
  7. 1
  8. 74
  9. 24
  10. Thursday
  11. 4
  12. 22
  13. 45
  14. Monday
  15. 625
  16. 1540
  17. 20000
  18. 156
  19. 128
  20. 40
  21. 9876543
  22. 693
  23. 4
  24. 5
  25. 7
  26. 31
  27. 7
  28. 112
  29. 188
  30. 71
  31. 1089
  32. 12
  33. 4
  34. 104
  35. 1
  36. 30
  37. 5
  38. 32
  39. 21
  40. 1

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