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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 473 · 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.Double 89 =
  2. 2.I thought of a number, added 1 and then doubled it. I got 32. What was my number?
  3. 3.1 + 2 + 3 + … + 100 =
  4. 4.1 + 2 + 3 + … + 22 =
  5. 5.Half of 102 =
  6. 6.If today is Sunday, what day was it 17 days ago? (a) Thursday (b) Wednesday (c) Sunday (d) Friday
  7. 7.9 × 3 = 2? — what is the missing digit?
  8. 8.I thought of a number, added 2 and then doubled it. I got 12. What was my number?
  9. 9.9 × 7 = ?3 — what is the missing digit?
  10. 10.10 × 9 =
  11. 11.27 × 1000 =
  12. 12.8 × 9 =
  13. 13.You have 12 coins. Each coin is ₹1 or ₹2, and together they make ₹19. How many ₹2 coins do you have?
  14. 14.Magic trick! Think of 9. Double it, add 18, halve it, then take away 9. What number do you get?
  15. 15.45 × ? = 450
  16. 16.7 × 9 =
  17. 17.What comes next? 7, 9, 11, 13, ? (a) 13 (b) 16 (c) 17 (d) 15
  18. 18.21 × 4 =
  19. 19.Half of 92 =
  20. 20.Magic square (every row, column and diagonal has the same total): 31 10 25 | ? 22 28 | 19 34 13. What is the missing number?
  21. 21.12 × 8 + 2 =
  22. 22.If today is Sunday, what day will it be after 20 days? (a) Tuesday (b) Friday (c) Saturday (d) Sunday
  23. 23.32 × 4 =
  24. 24.5 × 9 =
  25. 25.Think of 7. Multiply it by 3, then add 4. What number do you end with?
  26. 26.90 × 100 =
  27. 27.Odd one out: which number is NOT in the 5 times table? (a) 40 (b) 21 (c) 25 (d) 15
  28. 28.You have 5 coins. Each coin is ₹1 or ₹2, and together they make ₹7. How many ₹2 coins do you have?
  29. 29.If today is Wednesday, what day was it 38 days ago? (a) Wednesday (b) Saturday (c) Sunday (d) Monday
  30. 30.If today is Thursday, what day will it be after 21 days? (a) Sunday (b) Friday (c) Thursday (d) Wednesday
  31. 31.Magic square (every row, column and diagonal has the same total): 11 32 17 | 26 20 14 | 23 ? 29. What is the missing number?
  32. 32.Magic square (every row, column and diagonal has the same total): 21 36 ? | 18 24 30 | 33 12 27. What is the missing number?
  33. 33.Take 951. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  34. 34.1 + 3 + 5 + … + 27 =
  35. 35.What comes next? 25, 36, 49, 64, ? (a) 79 (b) 82 (c) 81 (d) 83
  36. 36.9 × 3 = ?7 — what is the missing digit?
  37. 37.A piggy bank has 5 coins of ₹5 and 5 coins of ₹2. How many rupees are in it?
  38. 38.Double 24 =
  39. 39.Take 890. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  40. 40.The 7th of a month is a Friday. What day is the 28th of the same month? (a) Saturday (b) Thursday (c) Monday (d) Friday

Answer key

  1. 178
  2. 15
  3. 5050
  4. 253
  5. 51
  6. Thursday
  7. 7
  8. 4
  9. 6
  10. 90
  11. 27000
  12. 72
  13. 7
  14. 9
  15. 10
  16. 63
  17. 15
  18. 84
  19. 46
  20. 16
  21. 98
  22. Saturday
  23. 128
  24. 45
  25. 25
  26. 9000
  27. 21
  28. 2
  29. Sunday
  30. Thursday
  31. 8
  32. 15
  33. 792
  34. 196
  35. 81
  36. 2
  37. 35
  38. 48
  39. 792
  40. Friday

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