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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 349 · 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. 1.4 × 9 =
  2. 2.The ages of two twins add up to 14. How old is each twin?
  3. 3.I thought of a number, added 1 and then doubled it. I got 24. What was my number?
  4. 4.The ages of two twins add up to 22. How old is each twin?
  5. 5.1 + 2 + 3 + … + 8 =
  6. 6.Magic square (every row, column and diagonal has the same total): 26 11 14 | 5 17 29 | 20 23 ?. What is the missing number?
  7. 7.1 + 3 + 5 + … + 49 =
  8. 8.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
  9. 9.46 × 4 =
  10. 10.If today is Friday, what day was it 42 days ago? (a) Thursday (b) Friday (c) Monday (d) Saturday
  11. 11.43 × ? = 4300
  12. 12.97 × ? = 9700
  13. 13.12345679 × 72 =
  14. 14.What comes next? 18, 27, 36, 45, ? (a) 45 (b) 54 (c) 55 (d) 63
  15. 15.12345679 × 45 =
  16. 16.44 × 4 =
  17. 17.9 × 5 = 4? — what is the missing digit?
  18. 18.9 × 4 = ?6 — what is the missing digit?
  19. 19.A piggy bank has 2 coins of ₹5 and 15 coins of ₹2. How many rupees are in it?
  20. 20.27 × 4 =
  21. 21.I thought of a number, multiplied it by 3 and added 5. I got 20. What was my number?
  22. 22.9 × 9 = 8? — what is the missing digit?
  23. 23.12345 × 9 + 6 =
  24. 24.?68 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.12345679 × 36 =
  26. 26.A father is 35 years old and his son is 12. How old was the father when the son was born?
  27. 27.20 × 1000 =
  28. 28.A father is 31 years old and his son is 9. How old was the father when the son was born?
  29. 29.14 × 4 =
  30. 30.1 + 2 + 3 + … + 43 =
  31. 31.The ages of two twins add up to 20. How old is each twin?
  32. 32.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
  33. 33.Half of 144 =
  34. 34.46 × 1000 =
  35. 35.11 × 1000 =
  36. 36.5 × 9 =
  37. 37.1 + 2 + 3 + … + 78 =
  38. 38.I thought of a number, multiplied it by 2 and added 9. I got 21. What was my number?
  39. 39.1 + 3 + 5 + … + 41 =
  40. 40.Magic trick! Think of 15. Double it, add 4, halve it, then take away 15. What number do you get?

Answer key

  1. 36
  2. 7
  3. 11
  4. 11
  5. 36
  6. 8
  7. 625
  8. 594
  9. 184
  10. Friday
  11. 100
  12. 100
  13. 888888888
  14. 54
  15. 555555555
  16. 176
  17. 5
  18. 3
  19. 40
  20. 108
  21. 5
  22. 1
  23. 111111
  24. 4
  25. 444444444
  26. 23
  27. 20000
  28. 22
  29. 56
  30. 946
  31. 10
  32. 396
  33. 72
  34. 46000
  35. 11000
  36. 45
  37. 3081
  38. 6
  39. 441
  40. 2

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