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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 255 · 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. 1.9 × 3 = 2? — what is the missing digit?
  2. 2.If today is Saturday, what day will it be after 42 days? (a) Saturday (b) Tuesday (c) Sunday (d) Friday
  3. 3.44 × 4 =
  4. 4.?88 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.37 × 27 =
  6. 6.792 + 297 =
  7. 7.I thought of a number, added 3 and then doubled it. I got 34. What was my number?
  8. 8.Magic trick! Think of 18. Double it, add 16, halve it, then take away 18. What number do you get?
  9. 9.9 × 10 = ?0 — what is the missing digit?
  10. 10.If today is Sunday, what day was it 22 days ago? (a) Friday (b) Sunday (c) Saturday (d) Tuesday
  11. 11.The ages of two twins add up to 8. How old is each twin?
  12. 12.I thought of a number, multiplied it by 2 and added 7. I got 27. What was my number?
  13. 13.9 × 4 = ?6 — what is the missing digit?
  14. 14.You have 15 coins. Each coin is ₹1 or ₹2, and together they make ₹22. How many ₹2 coins do you have?
  15. 15.1 + 2 + 3 + … + 88 =
  16. 16.The 4th of a month is a Friday. What day is the 14th of the same month? (a) Thursday (b) Monday (c) Tuesday (d) Sunday
  17. 17.A piggy bank has 6 coins of ₹5 and 14 coins of ₹2. How many rupees are in it?
  18. 18.The 6th of a month is a Friday. What day is the 25th of the same month? (a) Wednesday (b) Tuesday (c) Thursday (d) Saturday
  19. 19.9 × 7 = 6? — what is the missing digit?
  20. 20.1234 × 9 + 5 =
  21. 21.A girl is 6 years old and her brother is 2 years older. How old will her brother be in 6 years?
  22. 22.9 × 1 =
  23. 23.786 × ? = 7860
  24. 24.What comes next? 16, 25, 36, 49, ? (a) 65 (b) 66 (c) 64 (d) 62
  25. 25.Magic trick! Think of 13. Double it, add 4, halve it, then take away 13. What number do you get?
  26. 26.12345679 × 18 =
  27. 27.5 × 9 =
  28. 28.860? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.9 × 10 = 9? — what is the missing digit?
  30. 30.Magic square (every row, column and diagonal has the same total): 10 11 6 | ? 9 13 | 12 7 8. What is the missing number?
  31. 31.Half of 54 =
  32. 32.I thought of a number, multiplied it by 2 and added 3. I got 17. What was my number?
  33. 33.1 × 9 =
  34. 34.Double 12 =
  35. 35.67 × ? = 6700
  36. 36.1234567 × 8 + 7 =
  37. 37.Magic trick! Think of 10. Double it, add 4, halve it, then take away 10. What number do you get?
  38. 38.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  39. 39.I thought of a number, added 5 and then doubled it. I got 38. What was my number?
  40. 40.Think of 3. Multiply it by 2, then add 9. What number do you end with?

Answer key

  1. 7
  2. Saturday
  3. 176
  4. 2
  5. 999
  6. 1089
  7. 14
  8. 8
  9. 9
  10. Saturday
  11. 4
  12. 10
  13. 3
  14. 7
  15. 3916
  16. Monday
  17. 58
  18. Wednesday
  19. 3
  20. 11111
  21. 14
  22. 9
  23. 10
  24. 64
  25. 2
  26. 222222222
  27. 45
  28. 4
  29. 0
  30. 5
  31. 27
  32. 7
  33. 9
  34. 24
  35. 100
  36. 9876543
  37. 2
  38. 693
  39. 14
  40. 15

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