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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 679 · 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. 1.9 × 6 = ?4 — what is the missing digit?
  2. 2.Take 990. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  3. 3.I thought of a number, added 5 and then doubled it. I got 34. What was my number?
  4. 4.1 + 2 + 3 + … + 97 =
  5. 5.1 + 3 + 5 + … + 37 =
  6. 6.What comes next? 9, 13, 17, 21, ? (a) 21 (b) 26 (c) 29 (d) 25
  7. 7.Double 56 =
  8. 8.9 × 10 = 9? — what is the missing digit?
  9. 9.Magic square (every row, column and diagonal has the same total): 24 9 12 | 3 15 27 | ? 21 6. What is the missing number?
  10. 10.If today is Tuesday, what day will it be after 66 days? (a) Thursday (b) Saturday (c) Monday (d) Friday
  11. 11.12 × 9 + 3 =
  12. 12.Half of 164 =
  13. 13.21 × 100 =
  14. 14.6 × 10 =
  15. 15.12 × ? = 12000
  16. 16.9 × 7 =
  17. 17.If today is Thursday, what day will it be after 25 days? (a) Sunday (b) Thursday (c) Monday (d) Tuesday
  18. 18.9 × 5 =
  19. 19.15 × 4 =
  20. 20.289 × 10 =
  21. 21.Take 86 and take away the sum of its digits. What do you get?
  22. 22.30 × 4 =
  23. 23.11111 × 11111 =
  24. 24.1 + 2 + 3 + … + 38 =
  25. 25.I thought of a number, added 5 and then doubled it. I got 46. What was my number?
  26. 26.123456789 × 8 + 9 =
  27. 27.Half of 42 =
  28. 28.12345 × 9 + 6 =
  29. 29.A piggy bank has 10 coins of ₹5 and 2 coins of ₹2. How many rupees are in it?
  30. 30.If today is Saturday, what day will it be after 36 days? (a) Sunday (b) Saturday (c) Wednesday (d) Monday
  31. 31.A girl is 7 years old and her brother is 5 years older. How old will her brother be in 2 years?
  32. 32.525 × 10 =
  33. 33.Double 46 =
  34. 34.41 × 4 =
  35. 35.44 × 4 =
  36. 36.274? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.17?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.12345679 × 81 =
  39. 39.Double 54 =
  40. 40.Odd one out: which number is NOT in the 5 times table? (a) 10 (b) 25 (c) 31 (d) 40

Answer key

  1. 5
  2. 891
  3. 12
  4. 4753
  5. 361
  6. 25
  7. 112
  8. 0
  9. 18
  10. Friday
  11. 111
  12. 82
  13. 2100
  14. 60
  15. 1000
  16. 63
  17. Monday
  18. 45
  19. 60
  20. 2890
  21. 72
  22. 120
  23. 123454321
  24. 741
  25. 18
  26. 987654321
  27. 21
  28. 111111
  29. 54
  30. Sunday
  31. 14
  32. 5250
  33. 92
  34. 164
  35. 176
  36. 5
  37. 1
  38. 999999999
  39. 108
  40. 31

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