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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 265 · 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. 1.1 + 2 + 3 + … + 9 =
  2. 2.9 × 10 = ?0 — what is the missing digit?
  3. 3.You have 8 coins. Each coin is ₹1 or ₹2, and together they make ₹9. How many ₹2 coins do you have?
  4. 4.I thought of a number, added 3 and then doubled it. I got 16. What was my number?
  5. 5.Magic square (every row, column and diagonal has the same total): 4 3 8 | 9 5 ? | 2 7 6. What is the missing number?
  6. 6.9 × 4 = ?6 — what is the missing digit?
  7. 7.43 × 1000 =
  8. 8.If today is Monday, what day will it be after 59 days? (a) Thursday (b) Wednesday (c) Sunday (d) Friday
  9. 9.Odd one out: which number is NOT in the 9 times table? (a) 36 (b) 27 (c) 54 (d) 22
  10. 10.Double 32 =
  11. 11.What comes next? 5, 10, 20, 40, ? (a) 81 (b) 70 (c) 80 (d) 60
  12. 12.6 × 9 =
  13. 13.Half of 24 =
  14. 14.8?59 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.37 × 4 =
  16. 16.25 × 1000 =
  17. 17.12345679 × 63 =
  18. 18.1234567 × 8 + 7 =
  19. 19.1 + 3 + 5 + … + 15 =
  20. 20.Half of 142 =
  21. 21.891 + 198 =
  22. 22.Think of 4. Multiply it by 3, then add 6. What number do you end with?
  23. 23.Odd one out: which number is NOT in the 7 times table? (a) 28 (b) 49 (c) 35 (d) 15
  24. 24.123456789 × 8 + 9 =
  25. 25.Odd one out: which number is NOT in the 9 times table? (a) 18 (b) 54 (c) 24 (d) 45
  26. 26.732? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.What comes next? 1, 4, 9, 16, ? (a) 26 (b) 25 (c) 27 (d) 23
  28. 28.Magic trick! Think of 3. Double it, add 12, halve it, then take away 3. What number do you get?
  29. 29.The 9th of a month is a Sunday. What day is the 19th of the same month? (a) Tuesday (b) Saturday (c) Wednesday (d) Thursday
  30. 30.123456 × 8 + 6 =
  31. 31.The ages of two twins add up to 18. How old is each twin?
  32. 32.7?78 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.I thought of a number, added 1 and then doubled it. I got 14. What was my number?
  34. 34.Magic square (every row, column and diagonal has the same total): 17 3 13 | 7 11 15 | 9 19 ?. What is the missing number?
  35. 35.The 9th of a month is a Sunday. What day is the 27th of the same month? (a) Sunday (b) Wednesday (c) Thursday (d) Friday
  36. 36.The ages of two twins add up to 26. How old is each twin?
  37. 37.37 × 24 =
  38. 38.?19 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.1 + 2 + 3 + … + 27 =
  40. 40.A piggy bank has 4 coins of ₹5 and 9 coins of ₹2. How many rupees are in it?

Answer key

  1. 45
  2. 9
  3. 1
  4. 5
  5. 1
  6. 3
  7. 43000
  8. Thursday
  9. 22
  10. 64
  11. 80
  12. 54
  13. 12
  14. 5
  15. 148
  16. 25000
  17. 777777777
  18. 9876543
  19. 64
  20. 71
  21. 1089
  22. 18
  23. 15
  24. 987654321
  25. 24
  26. 6
  27. 25
  28. 6
  29. Wednesday
  30. 987654
  31. 9
  32. 5
  33. 6
  34. 5
  35. Thursday
  36. 13
  37. 888
  38. 8
  39. 378
  40. 38

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