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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 283 · 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.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  2. 2.18 × 4 =
  3. 3.40 × 4 =
  4. 4.If today is Tuesday, what day was it 39 days ago? (a) Saturday (b) Monday (c) Thursday (d) Friday
  5. 5.Double 24 =
  6. 6.9 × 10 = ?0 — what is the missing digit?
  7. 7.1 + 3 + 5 + … + 25 =
  8. 8.1 + 2 + 3 + … + 71 =
  9. 9.Double 31 =
  10. 10.98 × 100 =
  11. 11.You have 10 coins. Each coin is ₹1 or ₹2, and together they make ₹11. How many ₹2 coins do you have?
  12. 12.The ages of two twins add up to 10. How old is each twin?
  13. 13.9 × 5 = 4? — what is the missing digit?
  14. 14.11 × ? = 1100
  15. 15.Magic trick! Think of 20. Double it, add 14, halve it, then take away 20. What number do you get?
  16. 16.6 × 9 =
  17. 17.1 + 3 + 5 + … + 19 =
  18. 18.10 × 9 =
  19. 19.Magic trick! Think of 4. Double it, add 12, halve it, then take away 4. What number do you get?
  20. 20.A father is 37 years old and his son is 4. How old was the father when the son was born?
  21. 21.25 × 4 =
  22. 22.Think of 12. Multiply it by 4, then add 5. What number do you end with?
  23. 23.Think of 5. Multiply it by 2, then add 7. What number do you end with?
  24. 24.12345679 × 81 =
  25. 25.9 × 2 = 1? — what is the missing digit?
  26. 26.The 1st of a month is a Friday. What day is the 15th of the same month? (a) Saturday (b) Thursday (c) Monday (d) Friday
  27. 27.1 + 2 + 3 + … + 78 =
  28. 28.9 × 5 = ?5 — what is the missing digit?
  29. 29.17 × 4 =
  30. 30.1 + 2 + 3 + … + 28 =
  31. 31.17 × 1000 =
  32. 32.?337 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Double 79 =
  34. 34.12345679 × 54 =
  35. 35.Half of 76 =
  36. 36.9 × 4 =
  37. 37.Magic square (every row, column and diagonal has the same total): 10 5 12 | ? 9 7 | 6 13 8. What is the missing number?
  38. 38.63?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.9 × 6 = 5? — what is the missing digit?
  40. 40.123456 × 9 + 7 =

Answer key

  1. 297
  2. 72
  3. 160
  4. Friday
  5. 48
  6. 9
  7. 169
  8. 2556
  9. 62
  10. 9800
  11. 1
  12. 5
  13. 5
  14. 100
  15. 7
  16. 54
  17. 100
  18. 90
  19. 6
  20. 33
  21. 100
  22. 53
  23. 17
  24. 999999999
  25. 8
  26. Friday
  27. 3081
  28. 4
  29. 68
  30. 406
  31. 17000
  32. 5
  33. 158
  34. 666666666
  35. 38
  36. 36
  37. 11
  38. 9
  39. 4
  40. 1111111

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