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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 950 · 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.Magic square (every row, column and diagonal has the same total): 20 23 8 | 5 ? 29 | 26 11 14. What is the missing number?
  2. 2.8?20 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.A piggy bank has 3 coins of ₹5 and 15 coins of ₹2. How many rupees are in it?
  4. 4.35 × ? = 35000
  5. 5.Magic trick! Think of 4. Double it, add 10, halve it, then take away 4. What number do you get?
  6. 6.Double 43 =
  7. 7.9 × 6 = ?4 — what is the missing digit?
  8. 8.9 × 7 = ?3 — what is the missing digit?
  9. 9.The ages of two twins add up to 22. How old is each twin?
  10. 10.If today is Friday, what day was it 50 days ago? (a) Sunday (b) Wednesday (c) Friday (d) Thursday
  11. 11.9 × 10 =
  12. 12.Magic square (every row, column and diagonal has the same total): 9 ? 13 | 14 10 6 | 7 12 11. What is the missing number?
  13. 13.33 × 100 =
  14. 14.Odd one out: which number is NOT in the 3 times table? (a) 18 (b) 12 (c) 15 (d) 10
  15. 15.Double 97 =
  16. 16.1 + 2 + 3 + … + 37 =
  17. 17.9 × 4 = ?6 — what is the missing digit?
  18. 18.A girl is 11 years old and her brother is 6 years older. How old will her brother be in 3 years?
  19. 19.If today is Saturday, what day will it be after 76 days? (a) Thursday (b) Saturday (c) Monday (d) Friday
  20. 20.I thought of a number, multiplied it by 2 and added 7. I got 23. What was my number?
  21. 21.1 + 2 + 3 + … + 22 =
  22. 22.Magic square (every row, column and diagonal has the same total): 7 ? 9 | 8 6 4 | 3 10 5. What is the missing number?
  23. 23.1 + 3 + 5 + … + 31 =
  24. 24.Take 276. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  25. 25.You have 11 coins. Each coin is ₹1 or ₹2, and together they make ₹17. How many ₹2 coins do you have?
  26. 26.6?22 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.11 × 11 =
  28. 28.18 × 4 =
  29. 29.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
  30. 30.A piggy bank has 3 coins of ₹5 and 10 coins of ₹2. How many rupees are in it?
  31. 31.9 × 5 =
  32. 32.12345679 × 81 =
  33. 33.11 × 4 =
  34. 34.9 × 2 =
  35. 35.Magic square (every row, column and diagonal has the same total): 15 17 7 | 5 13 21 | 19 ? 11. What is the missing number?
  36. 36.30 × 4 =
  37. 37.A father is 33 years old and his son is 5. How old was the father when the son was born?
  38. 38.1 + 2 + 3 + … + 33 =
  39. 39.12345679 × 45 =
  40. 40.Take 289. Reverse its digits and take the smaller number away from the bigger one. What do you get?

Answer key

  1. 17
  2. 8
  3. 45
  4. 1000
  5. 5
  6. 86
  7. 5
  8. 6
  9. 11
  10. Thursday
  11. 90
  12. 8
  13. 3300
  14. 10
  15. 194
  16. 703
  17. 3
  18. 20
  19. Friday
  20. 8
  21. 253
  22. 2
  23. 256
  24. 396
  25. 6
  26. 8
  27. 121
  28. 72
  29. 495
  30. 35
  31. 45
  32. 999999999
  33. 44
  34. 18
  35. 9
  36. 120
  37. 28
  38. 561
  39. 555555555
  40. 693

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