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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 44 · 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): 16 6 8 | 2 10 ? | 12 14 4. What is the missing number?
  2. 2.The 9th of a month is a Monday. What day is the 19th of the same month? (a) Sunday (b) Friday (c) Wednesday (d) Thursday
  3. 3.In 4 years a boy will be 15 years old. How old was he 3 years ago?
  4. 4.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
  5. 5.Magic square (every row, column and diagonal has the same total): 12 13 8 | 7 11 15 | 14 9 ?. What is the missing number?
  6. 6.9 × 3 =
  7. 7.9 × 10 = 9? — what is the missing digit?
  8. 8.A father is 31 years old and his son is 9. How old was the father when the son was born?
  9. 9.39 × ? = 3900
  10. 10.What comes next? 25, 36, 49, 64, ? (a) 82 (b) 79 (c) 83 (d) 81
  11. 11.9 × 4 =
  12. 12.1 + 3 + 5 + … + 31 =
  13. 13.I thought of a number, added 1 and then doubled it. I got 24. What was my number?
  14. 14.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
  15. 15.8 × 9 =
  16. 16.Half of 156 =
  17. 17.Magic square (every row, column and diagonal has the same total): 13 11 ? | 23 15 7 | 9 19 17. What is the missing number?
  18. 18.Double 64 =
  19. 19.?474 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.Odd one out: which number is NOT in the 4 times table? (a) 12 (b) 16 (c) 25 (d) 28
  21. 21.37 × 18 =
  22. 22.I thought of a number, multiplied it by 5 and added 4. I got 14. What was my number?
  23. 23.If today is Thursday, what day was it 56 days ago? (a) Sunday (b) Friday (c) Wednesday (d) Thursday
  24. 24.9 × 2 = 1? — what is the missing digit?
  25. 25.11 × 11 =
  26. 26.Magic square (every row, column and diagonal has the same total): 28 ? 16 | 7 19 31 | 22 25 10. What is the missing number?
  27. 27.21 × 4 =
  28. 28.What comes next? 4, 9, 16, 25, ? (a) 37 (b) 34 (c) 38 (d) 36
  29. 29.6?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Take 62 and take away the sum of its digits. What do you get?
  31. 31.I thought of a number, multiplied it by 5 and added 8. I got 48. What was my number?
  32. 32.You have 15 coins. Each coin is ₹1 or ₹2, and together they make ₹20. How many ₹2 coins do you have?
  33. 33.258 × ? = 2580
  34. 34.75 × ? = 750
  35. 35.9 × 4 = ?6 — what is the missing digit?
  36. 36.Do the 1089 trick with 157: reverse and subtract, then reverse that answer and add. What do you get?
  37. 37.35 × 4 =
  38. 38.Take 981. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  39. 39.Double 25 =
  40. 40.1234 × 8 + 4 =

Answer key

  1. 18
  2. Thursday
  3. 8
  4. 891
  5. 10
  6. 27
  7. 0
  8. 22
  9. 100
  10. 81
  11. 36
  12. 256
  13. 11
  14. 594
  15. 72
  16. 78
  17. 21
  18. 128
  19. 3
  20. 25
  21. 666
  22. 2
  23. Thursday
  24. 8
  25. 121
  26. 13
  27. 84
  28. 36
  29. 9
  30. 54
  31. 8
  32. 5
  33. 10
  34. 10
  35. 3
  36. 1089
  37. 140
  38. 792
  39. 50
  40. 9876

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