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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 129 · 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 + 3 + 5 + … + 13 =
  2. 2.I thought of a number, added 8 and then doubled it. I got 44. What was my number?
  3. 3.Do the 1089 trick with 762: reverse and subtract, then reverse that answer and add. What do you get?
  4. 4.Double 21 =
  5. 5.17 × 100 =
  6. 6.In 2 years a boy will be 15 years old. How old was he 6 years ago?
  7. 7.37 × 24 =
  8. 8.Half of 102 =
  9. 9.11111 × 11111 =
  10. 10.The ages of two twins add up to 20. How old is each twin?
  11. 11.Take 920. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  12. 12.9 × 2 = ?8 — what is the missing digit?
  13. 13.The 5th of a month is a Friday. What day is the 27th of the same month? (a) Friday (b) Sunday (c) Saturday (d) Tuesday
  14. 14.90 × ? = 9000
  15. 15.Magic square (every row, column and diagonal has the same total): ? 3 10 | 9 7 5 | 4 11 6. What is the missing number?
  16. 16.A piggy bank has 5 coins of ₹5 and 5 coins of ₹2. How many rupees are in it?
  17. 17.9 × 1 =
  18. 18.12345678 × 8 + 8 =
  19. 19.9 × 2 = 1? — what is the missing digit?
  20. 20.1 + 2 + 3 + … + 88 =
  21. 21.4 × 1000 =
  22. 22.Double 32 =
  23. 23.If today is Saturday, what day was it 25 days ago? (a) Wednesday (b) Monday (c) Friday (d) Tuesday
  24. 24.1 + 2 + 3 + … + 46 =
  25. 25.Double 37 =
  26. 26.9 × 8 =
  27. 27.78 × 100 =
  28. 28.11 × 11 =
  29. 29.Double 15 =
  30. 30.9 × 5 =
  31. 31.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
  32. 32.1 × 9 =
  33. 33.9 × 10 = 9? — what is the missing digit?
  34. 34.I thought of a number, multiplied it by 4 and added 4. I got 44. What was my number?
  35. 35.49 × 4 =
  36. 36.60 × ? = 6000
  37. 37.39 × 1000 =
  38. 38.12345679 × 72 =
  39. 39.Double 94 =
  40. 40.37 × 9 =

Answer key

  1. 49
  2. 14
  3. 1089
  4. 42
  5. 1700
  6. 7
  7. 888
  8. 51
  9. 123454321
  10. 10
  11. 891
  12. 1
  13. Saturday
  14. 100
  15. 8
  16. 35
  17. 9
  18. 98765432
  19. 8
  20. 3916
  21. 4000
  22. 64
  23. Tuesday
  24. 1081
  25. 74
  26. 72
  27. 7800
  28. 121
  29. 30
  30. 45
  31. 495
  32. 9
  33. 0
  34. 10
  35. 196
  36. 100
  37. 39000
  38. 888888888
  39. 188
  40. 333

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