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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 107 · 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.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
  2. 2.1 + 2 + 3 + … + 87 =
  3. 3.12 × 8 + 2 =
  4. 4.Magic square (every row, column and diagonal has the same total): 4 11 6 | 9 7 ? | 8 3 10. What is the missing number?
  5. 5.1 + 2 + 3 + … + 50 =
  6. 6.Do the 1089 trick with 109: reverse and subtract, then reverse that answer and add. What do you get?
  7. 7.A piggy bank has 3 coins of ₹5 and 7 coins of ₹2. How many rupees are in it?
  8. 8.17 × 4 =
  9. 9.Half of 102 =
  10. 10.You have 9 coins. Each coin is ₹1 or ₹2, and together they make ₹14. How many ₹2 coins do you have?
  11. 11.7?69 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.I thought of a number, multiplied it by 2 and added 2. I got 16. What was my number?
  13. 13.If today is Friday, what day will it be after 96 days? (a) Thursday (b) Saturday (c) Wednesday (d) Tuesday
  14. 14.891 + 198 =
  15. 15.9 × 10 = 9? — what is the missing digit?
  16. 16.38?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.49 × 4 =
  18. 18.4?83 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.9 × 4 =
  20. 20.Half of 158 =
  21. 21.403 × 10 =
  22. 22.12345678 × 9 + 9 =
  23. 23.Magic square (every row, column and diagonal has the same total): 23 9 19 | ? 17 21 | 15 25 11. What is the missing number?
  24. 24.12345 × 9 + 6 =
  25. 25.4 × 9 =
  26. 26.60 × 4 =
  27. 27.Half of 44 =
  28. 28.Take 54 and take away the sum of its digits. What do you get?
  29. 29.Take 870. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  30. 30.What comes next? 5, 10, 20, 40, ? (a) 60 (b) 81 (c) 70 (d) 80
  31. 31.9 × 4 = 3? — what is the missing digit?
  32. 32.9 × 7 = 6? — what is the missing digit?
  33. 33.A girl is 7 years old and her brother is 3 years older. How old will her brother be in 3 years?
  34. 34.50 × 4 =
  35. 35.Do the 1089 trick with 840: reverse and subtract, then reverse that answer and add. What do you get?
  36. 36.Magic square (every row, column and diagonal has the same total): 17 7 21 | 19 15 ? | 9 23 13. What is the missing number?
  37. 37.Double 82 =
  38. 38.What comes next? 3, 6, 12, 24, ? (a) 49 (b) 48 (c) 42 (d) 36
  39. 39.44 × 4 =
  40. 40.13 × 4 =

Answer key

  1. 198
  2. 3828
  3. 98
  4. 5
  5. 1275
  6. 1089
  7. 29
  8. 68
  9. 51
  10. 5
  11. 5
  12. 7
  13. Wednesday
  14. 1089
  15. 0
  16. 1
  17. 196
  18. 3
  19. 36
  20. 79
  21. 4030
  22. 111111111
  23. 13
  24. 111111
  25. 36
  26. 240
  27. 22
  28. 45
  29. 792
  30. 80
  31. 6
  32. 3
  33. 13
  34. 200
  35. 1089
  36. 11
  37. 164
  38. 48
  39. 176
  40. 52

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