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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 613 · 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.If today is Monday, what day was it 13 days ago? (a) Wednesday (b) Monday (c) Friday (d) Tuesday
  2. 2.If today is Tuesday, what day will it be after 12 days? (a) Sunday (b) Wednesday (c) Saturday (d) Monday
  3. 3.665 × 10 =
  4. 4.34 × 100 =
  5. 5.31?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.A father is 36 years old and his son is 5. How old was the father when the son was born?
  7. 7.8 × 9 =
  8. 8.Do the 1089 trick with 800: reverse and subtract, then reverse that answer and add. What do you get?
  9. 9.Odd one out: which number is NOT in the 6 times table? (a) 51 (b) 12 (c) 30 (d) 48
  10. 10.You have 12 coins. Each coin is ₹1 or ₹2, and together they make ₹14. How many ₹2 coins do you have?
  11. 11.40 × 4 =
  12. 12.1 + 3 + 5 + … + 39 =
  13. 13.Take 920. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  14. 14.If today is Tuesday, what day will it be after 28 days? (a) Friday (b) Tuesday (c) Monday (d) Wednesday
  15. 15.9 × 5 = ?5 — what is the missing digit?
  16. 16.Magic square (every row, column and diagonal has the same total): ? 9 4 | 3 7 11 | 10 5 6. What is the missing number?
  17. 17.Do the 1089 trick with 852: reverse and subtract, then reverse that answer and add. What do you get?
  18. 18.9 × 3 = 2? — what is the missing digit?
  19. 19.Magic square (every row, column and diagonal has the same total): 16 26 ? | 14 18 22 | 24 10 20. What is the missing number?
  20. 20.9 × 4 = ?6 — what is the missing digit?
  21. 21.Magic square (every row, column and diagonal has the same total): 8 ? 10 | 13 11 9 | 12 7 14. What is the missing number?
  22. 22.26 × 100 =
  23. 23.A piggy bank has 2 coins of ₹5 and 13 coins of ₹2. How many rupees are in it?
  24. 24.9 × 9 =
  25. 25.24?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.14 × 1000 =
  27. 27.Magic square (every row, column and diagonal has the same total): 6 16 14 | 20 12 4 | ? 8 18. What is the missing number?
  28. 28.9 × 2 = ?8 — what is the missing digit?
  29. 29.Half of 192 =
  30. 30.7 × 4 =
  31. 31.Take 22 and take away the sum of its digits. What do you get?
  32. 32.9 × 10 =
  33. 33.9 × 9 = ?1 — what is the missing digit?
  34. 34.Magic square (every row, column and diagonal has the same total): 17 10 15 | 12 ? 16 | 13 18 11. What is the missing number?
  35. 35.?271 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.The 8th of a month is a Friday. What day is the 19th of the same month? (a) Tuesday (b) Monday (c) Friday (d) Wednesday
  37. 37.9 × 1000 =
  38. 38.96 × 100 =
  39. 39.You have 11 coins. Each coin is ₹1 or ₹2, and together they make ₹15. How many ₹2 coins do you have?
  40. 40.123 × 9 + 4 =

Answer key

  1. Tuesday
  2. Sunday
  3. 6650
  4. 3400
  5. 5
  6. 31
  7. 72
  8. 1089
  9. 51
  10. 2
  11. 160
  12. 400
  13. 891
  14. Tuesday
  15. 4
  16. 8
  17. 1089
  18. 7
  19. 12
  20. 3
  21. 15
  22. 2600
  23. 36
  24. 81
  25. 5
  26. 14000
  27. 10
  28. 1
  29. 96
  30. 28
  31. 18
  32. 90
  33. 8
  34. 14
  35. 8
  36. Tuesday
  37. 9000
  38. 9600
  39. 4
  40. 1111

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