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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 603 · 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.Magic trick! Think of 18. Double it, add 6, halve it, then take away 18. What number do you get?
  2. 2.Double 66 =
  3. 3.If today is Tuesday, what day was it 28 days ago? (a) Wednesday (b) Tuesday (c) Friday (d) Monday
  4. 4.9 × 6 =
  5. 5.A piggy bank has 2 coins of ₹5 and 3 coins of ₹2. How many rupees are in it?
  6. 6.Magic trick! Think of 18. Double it, add 16, halve it, then take away 18. What number do you get?
  7. 7.Magic square (every row, column and diagonal has the same total): 5 ? 9 | 10 6 2 | 3 8 7. What is the missing number?
  8. 8.100? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.1 × 9 =
  10. 10.If today is Sunday, what day will it be after 18 days? (a) Sunday (b) Wednesday (c) Thursday (d) Friday
  11. 11.I thought of a number, added 1 and then doubled it. I got 16. What was my number?
  12. 12.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
  13. 13.9 × 6 = 5? — what is the missing digit?
  14. 14.5 × 9 =
  15. 15.12345678 × 8 + 8 =
  16. 16.25 × 1000 =
  17. 17.9 × 6 = ?4 — what is the missing digit?
  18. 18.I thought of a number, multiplied it by 2 and added 7. I got 15. What was my number?
  19. 19.If today is Tuesday, what day was it 56 days ago? (a) Friday (b) Tuesday (c) Wednesday (d) Monday
  20. 20.I thought of a number, multiplied it by 2 and added 6. I got 14. What was my number?
  21. 21.58 × 4 =
  22. 22.Magic square (every row, column and diagonal has the same total): 26 29 14 | 11 23 ? | 32 17 20. What is the missing number?
  23. 23.53 × 4 =
  24. 24.1 + 2 + 3 + … + 87 =
  25. 25.Magic square (every row, column and diagonal has the same total): 22 12 14 | 8 16 24 | ? 20 10. What is the missing number?
  26. 26.Half of 92 =
  27. 27.9 × 9 = ?1 — what is the missing digit?
  28. 28.9 × 2 = 1? — what is the missing digit?
  29. 29.?555 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.8 × 4 =
  31. 31.Double 52 =
  32. 32.1 + 2 + 3 + … + 33 =
  33. 33.7 × 4 =
  34. 34.Think of 9. Multiply it by 3, then add 4. What number do you end with?
  35. 35.Odd one out: which number is NOT in the 7 times table? (a) 53 (b) 35 (c) 42 (d) 28
  36. 36.A piggy bank has 9 coins of ₹5 and 2 coins of ₹2. How many rupees are in it?
  37. 37.30 × 4 =
  38. 38.10 × 9 =
  39. 39.Take 288. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  40. 40.9 × 10 = ?0 — what is the missing digit?

Answer key

  1. 3
  2. 132
  3. Tuesday
  4. 54
  5. 16
  6. 8
  7. 4
  8. 8
  9. 9
  10. Thursday
  11. 7
  12. 891
  13. 4
  14. 45
  15. 98765432
  16. 25000
  17. 5
  18. 4
  19. Tuesday
  20. 4
  21. 232
  22. 35
  23. 212
  24. 3828
  25. 18
  26. 46
  27. 8
  28. 8
  29. 3
  30. 32
  31. 104
  32. 561
  33. 28
  34. 31
  35. 53
  36. 49
  37. 120
  38. 90
  39. 594
  40. 9

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