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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 823 · 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. 1.158 × ? = 1580
  2. 2.If today is Monday, what day will it be after 31 days? (a) Sunday (b) Friday (c) Wednesday (d) Thursday
  3. 3.8 × 4 =
  4. 4.I thought of a number, multiplied it by 3 and added 8. I got 29. What was my number?
  5. 5.What comes next? 16, 25, 36, 49, ? (a) 65 (b) 64 (c) 66 (d) 62
  6. 6.12 × 4 =
  7. 7.2 × 9 =
  8. 8.123456 × 9 + 7 =
  9. 9.59 × 4 =
  10. 10.82 × ? = 8200
  11. 11.297 + 792 =
  12. 12.Do the 1089 trick with 440: reverse and subtract, then reverse that answer and add. What do you get?
  13. 13.Think of 4. Multiply it by 5, then add 7. What number do you end with?
  14. 14.What comes next? 4, 9, 16, 25, ? (a) 37 (b) 34 (c) 38 (d) 36
  15. 15.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
  16. 16.14 × ? = 1400
  17. 17.Double 12 =
  18. 18.9 × 7 = ?3 — what is the missing digit?
  19. 19.A father is 39 years old and his son is 12. How old was the father when the son was born?
  20. 20.41 × 4 =
  21. 21.What comes next? 17, 21, 25, 29, ? (a) 33 (b) 37 (c) 29 (d) 34
  22. 22.What comes next? 1, 2, 4, 8, ? (a) 12 (b) 17 (c) 16 (d) 14
  23. 23.?443 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.If today is Thursday, what day was it 58 days ago? (a) Wednesday (b) Monday (c) Friday (d) Tuesday
  25. 25.Double 11 =
  26. 26.The 7th of a month is a Friday. What day is the 29th of the same month? (a) Friday (b) Saturday (c) Sunday (d) Tuesday
  27. 27.A piggy bank has 8 coins of ₹5 and 5 coins of ₹2. How many rupees are in it?
  28. 28.9 × 4 = ?6 — what is the missing digit?
  29. 29.Do the 1089 trick with 229: reverse and subtract, then reverse that answer and add. What do you get?
  30. 30.Do the 1089 trick with 145: reverse and subtract, then reverse that answer and add. What do you get?
  31. 31.If today is Sunday, what day was it 58 days ago? (a) Saturday (b) Monday (c) Thursday (d) Friday
  32. 32.10 × 4 =
  33. 33.Odd one out: which number is NOT in the 5 times table? (a) 38 (b) 10 (c) 25 (d) 20
  34. 34.Magic square (every row, column and diagonal has the same total): 10 ? 18 | 20 12 4 | 6 16 14. What is the missing number?
  35. 35.You have 15 coins. Each coin is ₹1 or ₹2, and together they make ₹17. How many ₹2 coins do you have?
  36. 36.Take 45 and take away the sum of its digits. What do you get?
  37. 37.Odd one out: which number is NOT in the 8 times table? (a) 24 (b) 79 (c) 32 (d) 16
  38. 38.Magic trick! Think of 3. Double it, add 10, halve it, then take away 3. What number do you get?
  39. 39.Half of 66 =
  40. 40.You have 6 coins. Each coin is ₹1 or ₹2, and together they make ₹8. How many ₹2 coins do you have?

Answer key

  1. 10
  2. Thursday
  3. 32
  4. 7
  5. 64
  6. 48
  7. 18
  8. 1111111
  9. 236
  10. 100
  11. 1089
  12. 1089
  13. 27
  14. 36
  15. 198
  16. 100
  17. 24
  18. 6
  19. 27
  20. 164
  21. 33
  22. 16
  23. 7
  24. Tuesday
  25. 22
  26. Saturday
  27. 50
  28. 3
  29. 1089
  30. 1089
  31. Friday
  32. 40
  33. 38
  34. 8
  35. 2
  36. 36
  37. 79
  38. 5
  39. 33
  40. 2

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