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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 428 · 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. 1.2 × 9 =
  2. 2.You have 6 coins. Each coin is ₹1 or ₹2, and together they make ₹9. How many ₹2 coins do you have?
  3. 3.396 + 693 =
  4. 4.Take 31 and take away the sum of its digits. What do you get?
  5. 5.9 × 7 = ?3 — what is the missing digit?
  6. 6.Magic square (every row, column and diagonal has the same total): 14 16 6 | 4 12 20 | ? 8 10. What is the missing number?
  7. 7.If today is Monday, what day was it 50 days ago? (a) Wednesday (b) Sunday (c) Saturday (d) Monday
  8. 8.You have 10 coins. Each coin is ₹1 or ₹2, and together they make ₹13. How many ₹2 coins do you have?
  9. 9.703 × 10 =
  10. 10.15 × ? = 1500
  11. 11.8?92 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.A father is 44 years old and his son is 9. How old was the father when the son was born?
  13. 13.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  14. 14.3 × 9 =
  15. 15.If today is Wednesday, what day was it 39 days ago? (a) Sunday (b) Tuesday (c) Friday (d) Saturday
  16. 16.A piggy bank has 7 coins of ₹5 and 8 coins of ₹2. How many rupees are in it?
  17. 17.A piggy bank has 8 coins of ₹5 and 5 coins of ₹2. How many rupees are in it?
  18. 18.12 × 9 + 3 =
  19. 19.What comes next? 1, 4, 7, 10, ? (a) 10 (b) 13 (c) 14 (d) 16
  20. 20.Take 34 and take away the sum of its digits. What do you get?
  21. 21.8 × 4 =
  22. 22.Magic square (every row, column and diagonal has the same total): 11 10 15 | 16 12 8 | ? 14 13. What is the missing number?
  23. 23.Magic square (every row, column and diagonal has the same total): 17 3 13 | 7 ? 15 | 9 19 5. What is the missing number?
  24. 24.?053 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.If today is Thursday, what day was it 35 days ago? (a) Sunday (b) Thursday (c) Wednesday (d) Friday
  26. 26.44 × 4 =
  27. 27.Double 97 =
  28. 28.If today is Saturday, what day was it 19 days ago? (a) Sunday (b) Thursday (c) Tuesday (d) Monday
  29. 29.If today is Wednesday, what day will it be after 94 days? (a) Tuesday (b) Friday (c) Saturday (d) Sunday
  30. 30.1 + 2 + 3 + … + 51 =
  31. 31.12345679 × 45 =
  32. 32.18 × 4 =
  33. 33.9 × 1 =
  34. 34.Double 22 =
  35. 35.9 × 8 = 7? — what is the missing digit?
  36. 36.Take 279. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  37. 37.28 × 4 =
  38. 38.12345679 × 36 =
  39. 39.111 × 111 =
  40. 40.The 4th of a month is a Friday. What day is the 18th of the same month? (a) Saturday (b) Thursday (c) Friday (d) Monday

Answer key

  1. 18
  2. 3
  3. 1089
  4. 27
  5. 6
  6. 18
  7. Sunday
  8. 3
  9. 7030
  10. 100
  11. 8
  12. 35
  13. 297
  14. 27
  15. Saturday
  16. 51
  17. 50
  18. 111
  19. 13
  20. 27
  21. 32
  22. 9
  23. 11
  24. 1
  25. Thursday
  26. 176
  27. 194
  28. Monday
  29. Saturday
  30. 1326
  31. 555555555
  32. 72
  33. 9
  34. 44
  35. 2
  36. 693
  37. 112
  38. 444444444
  39. 12321
  40. Friday

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