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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 550 · 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 6 years old and her brother is 4 years older. How old will her brother be in 7 years?
  2. 2.Take 57 and take away the sum of its digits. What do you get?
  3. 3.Half of 186 =
  4. 4.In 2 years a boy will be 16 years old. How old was he 4 years ago?
  5. 5.Do the 1089 trick with 108: reverse and subtract, then reverse that answer and add. What do you get?
  6. 6.9 × 8 =
  7. 7.?213 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.Double 69 =
  9. 9.29 × 4 =
  10. 10.Do the 1089 trick with 351: reverse and subtract, then reverse that answer and add. What do you get?
  11. 11.Think of 9. Multiply it by 4, then add 6. What number do you end with?
  12. 12.Half of 98 =
  13. 13.Double 25 =
  14. 14.In 6 years a boy will be 18 years old. How old was he 4 years ago?
  15. 15.I thought of a number, multiplied it by 3 and added 3. I got 21. What was my number?
  16. 16.Take 840. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  17. 17.If today is Thursday, what day will it be after 27 days? (a) Wednesday (b) Tuesday (c) Saturday (d) Thursday
  18. 18.123456789 × 8 + 9 =
  19. 19.17 × 4 =
  20. 20.47 × 4 =
  21. 21.470 × 10 =
  22. 22.What comes next? 10, 15, 20, 25, ? (a) 31 (b) 30 (c) 25 (d) 35
  23. 23.A piggy bank has 8 coins of ₹5 and 9 coins of ₹2. How many rupees are in it?
  24. 24.594 + 495 =
  25. 25.101 × 10 =
  26. 26.11111 × 11111 =
  27. 27.376? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.Magic trick! Think of 6. Double it, add 10, halve it, then take away 6. What number do you get?
  29. 29.1 + 3 + 5 + … + 25 =
  30. 30.The ages of two twins add up to 26. How old is each twin?
  31. 31.37 × 4 =
  32. 32.The 5th of a month is a Saturday. What day is the 18th of the same month? (a) Thursday (b) Saturday (c) Monday (d) Friday
  33. 33.1 + 3 + 5 + … + 27 =
  34. 34.Take 65 and take away the sum of its digits. What do you get?
  35. 35.12345 × 8 + 5 =
  36. 36.45 × 100 =
  37. 37.1 + 2 + 3 + … + 10 =
  38. 38.9 × 7 = ?3 — what is the missing digit?
  39. 39.?10 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.A girl is 9 years old and her brother is 3 years older. How old will her brother be in 9 years?

Answer key

  1. 17
  2. 45
  3. 93
  4. 10
  5. 1089
  6. 72
  7. 3
  8. 138
  9. 116
  10. 1089
  11. 42
  12. 49
  13. 50
  14. 8
  15. 6
  16. 792
  17. Wednesday
  18. 987654321
  19. 68
  20. 188
  21. 4700
  22. 30
  23. 58
  24. 1089
  25. 1010
  26. 123454321
  27. 2
  28. 5
  29. 169
  30. 13
  31. 148
  32. Friday
  33. 196
  34. 54
  35. 98765
  36. 4500
  37. 55
  38. 6
  39. 8
  40. 21

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