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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 646 · 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.A girl is 12 years old and her brother is 2 years older. How old will her brother be in 3 years?
  2. 2.45 × 4 =
  3. 3.12345679 × 63 =
  4. 4.1 + 2 + 3 + … + 45 =
  5. 5.9 × 8 = 7? — what is the missing digit?
  6. 6.I thought of a number, multiplied it by 5 and added 8. I got 68. What was my number?
  7. 7.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  8. 8.9 × 10 = ?0 — what is the missing digit?
  9. 9.9 × 2 =
  10. 10.5 × 9 =
  11. 11.?489 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.57 × 4 =
  13. 13.If today is Thursday, what day will it be after 79 days? (a) Sunday (b) Friday (c) Tuesday (d) Saturday
  14. 14.If today is Wednesday, what day will it be after 21 days? (a) Thursday (b) Tuesday (c) Saturday (d) Wednesday
  15. 15.42 × 100 =
  16. 16.1 + 3 + 5 + … + 11 =
  17. 17.A father is 35 years old and his son is 9. How old was the father when the son was born?
  18. 18.You have 5 coins. Each coin is ₹1 or ₹2, and together they make ₹7. How many ₹2 coins do you have?
  19. 19.17 × 4 =
  20. 20.1 + 2 + 3 + … + 94 =
  21. 21.Magic trick! Think of 13. Double it, add 12, halve it, then take away 13. What number do you get?
  22. 22.14 × 4 =
  23. 23.9 × 8 = ?2 — what is the missing digit?
  24. 24.792 + 297 =
  25. 25.Magic square (every row, column and diagonal has the same total): 21 ? 15 | 18 24 30 | 33 12 27. What is the missing number?
  26. 26.9 × 3 = ?7 — what is the missing digit?
  27. 27.9 × 7 = ?3 — what is the missing digit?
  28. 28.398 × 10 =
  29. 29.Double 17 =
  30. 30.12345679 × 27 =
  31. 31.441 × 10 =
  32. 32.Magic square (every row, column and diagonal has the same total): 14 9 10 | 7 11 15 | ? 13 8. What is the missing number?
  33. 33.27 × 10 =
  34. 34.342? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.Magic trick! Think of 3. Double it, add 16, halve it, then take away 3. What number do you get?
  36. 36.9 × 9 = ?1 — what is the missing digit?
  37. 37.9 × 4 = ?6 — what is the missing digit?
  38. 38.A piggy bank has 11 coins of ₹5 and 3 coins of ₹2. How many rupees are in it?
  39. 39.What comes next? 5, 10, 20, 40, ? (a) 70 (b) 81 (c) 60 (d) 80
  40. 40.You have 12 coins. Each coin is ₹1 or ₹2, and together they make ₹20. How many ₹2 coins do you have?

Answer key

  1. 17
  2. 180
  3. 777777777
  4. 1035
  5. 2
  6. 12
  7. 297
  8. 9
  9. 18
  10. 45
  11. 6
  12. 228
  13. Saturday
  14. Wednesday
  15. 4200
  16. 36
  17. 26
  18. 2
  19. 68
  20. 4465
  21. 6
  22. 56
  23. 7
  24. 1089
  25. 36
  26. 2
  27. 6
  28. 3980
  29. 34
  30. 333333333
  31. 4410
  32. 12
  33. 270
  34. 9
  35. 8
  36. 8
  37. 3
  38. 61
  39. 80
  40. 8

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