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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 434 · 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. 1.11?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.36 × 4 =
  3. 3.5?66 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.39 × ? = 39000
  5. 5.37 × 6 =
  6. 6.Double 62 =
  7. 7.11 × 11 =
  8. 8.9 × 6 = 5? — what is the missing digit?
  9. 9.Magic trick! Think of 11. Double it, add 6, halve it, then take away 11. What number do you get?
  10. 10.1 + 2 + 3 + … + 24 =
  11. 11.1 × 9 =
  12. 12.Magic square (every row, column and diagonal has the same total): 12 22 20 | 26 ? 10 | 16 14 24. What is the missing number?
  13. 13.9 × 2 = 1? — what is the missing digit?
  14. 14.Take 39 and take away the sum of its digits. What do you get?
  15. 15.1 + 3 + 5 + … + 27 =
  16. 16.Magic square (every row, column and diagonal has the same total): 19 16 31 | 34 22 10 | ? 28 25. What is the missing number?
  17. 17.A piggy bank has 12 coins of ₹5 and 14 coins of ₹2. How many rupees are in it?
  18. 18.318 × 10 =
  19. 19.12345 × 8 + 5 =
  20. 20.A father is 42 years old and his son is 5. How old was the father when the son was born?
  21. 21.Take 338. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  22. 22.11111 × 11111 =
  23. 23.A girl is 10 years old and her brother is 5 years older. How old will her brother be in 4 years?
  24. 24.Magic square (every row, column and diagonal has the same total): 15 10 ? | 8 12 16 | 13 14 9. What is the missing number?
  25. 25.Take 15 and take away the sum of its digits. What do you get?
  26. 26.9 × 1 =
  27. 27.37 × 9 =
  28. 28.9 × 1000 =
  29. 29.If today is Sunday, what day will it be after 10 days? (a) Tuesday (b) Saturday (c) Thursday (d) Wednesday
  30. 30.I thought of a number, added 1 and then doubled it. I got 38. What was my number?
  31. 31.What comes next? 11, 19, 27, 35, ? (a) 44 (b) 35 (c) 43 (d) 51
  32. 32.Magic trick! Think of 6. Double it, add 18, halve it, then take away 6. What number do you get?
  33. 33.46 × ? = 4600
  34. 34.38?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.9 × 4 =
  36. 36.If today is Saturday, what day was it 38 days ago? (a) Thursday (b) Wednesday (c) Saturday (d) Tuesday
  37. 37.9 × 8 = ?2 — what is the missing digit?
  38. 38.29 × 4 =
  39. 39.The 9th of a month is a Friday. What day is the 23rd of the same month? (a) Monday (b) Friday (c) Thursday (d) Saturday
  40. 40.30 × 4 =

Answer key

  1. 7
  2. 144
  3. 1
  4. 1000
  5. 222
  6. 124
  7. 121
  8. 4
  9. 3
  10. 300
  11. 9
  12. 18
  13. 8
  14. 27
  15. 196
  16. 13
  17. 88
  18. 3180
  19. 98765
  20. 37
  21. 495
  22. 123454321
  23. 19
  24. 11
  25. 9
  26. 9
  27. 333
  28. 9000
  29. Wednesday
  30. 18
  31. 43
  32. 9
  33. 100
  34. 5
  35. 36
  36. Wednesday
  37. 7
  38. 116
  39. Friday
  40. 120

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