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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 450 · 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.?868 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.The ages of two twins add up to 14. How old is each twin?
  3. 3.In 6 years a boy will be 16 years old. How old was he 6 years ago?
  4. 4.600 × ? = 6000
  5. 5.198 × 10 =
  6. 6.5 × 9 =
  7. 7.Odd one out: which number is NOT in the 8 times table? (a) 56 (b) 48 (c) 62 (d) 24
  8. 8.9 × 9 = 8? — what is the missing digit?
  9. 9.11 × 4 =
  10. 10.12345678 × 9 + 9 =
  11. 11.Do the 1089 trick with 580: reverse and subtract, then reverse that answer and add. What do you get?
  12. 12.Double 19 =
  13. 13.1 + 2 + 3 + … + 43 =
  14. 14.59 × 4 =
  15. 15.The 1st of a month is a Thursday. What day is the 15th of the same month? (a) Thursday (b) Sunday (c) Wednesday (d) Friday
  16. 16.Magic square (every row, column and diagonal has the same total): 20 35 ? | 17 23 29 | 32 11 26. What is the missing number?
  17. 17.If today is Thursday, what day will it be after 64 days? (a) Thursday (b) Monday (c) Saturday (d) Friday
  18. 18.I thought of a number, multiplied it by 2 and added 4. I got 34. What was my number?
  19. 19.Magic square (every row, column and diagonal has the same total): 10 3 8 | 5 ? 9 | 6 11 4. What is the missing number?
  20. 20.If today is Tuesday, what day was it 44 days ago? (a) Monday (b) Wednesday (c) Sunday (d) Saturday
  21. 21.Magic square (every row, column and diagonal has the same total): 14 16 6 | 4 12 ? | 18 8 10. What is the missing number?
  22. 22.Magic square (every row, column and diagonal has the same total): 7 22 19 | 28 16 ? | 13 10 25. What is the missing number?
  23. 23.9 × 6 = ?4 — what is the missing digit?
  24. 24.9 × 1000 =
  25. 25.I thought of a number, multiplied it by 2 and added 2. I got 18. What was my number?
  26. 26.9 × 9 =
  27. 27.You have 9 coins. Each coin is ₹1 or ₹2, and together they make ₹12. How many ₹2 coins do you have?
  28. 28.12345679 × 18 =
  29. 29.9 × 2 = 1? — what is the missing digit?
  30. 30.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  31. 31.204 × 10 =
  32. 32.Magic square (every row, column and diagonal has the same total): 8 23 20 | 29 17 5 | ? 11 26. What is the missing number?
  33. 33.The ages of two twins add up to 12. How old is each twin?
  34. 34.If today is Wednesday, what day will it be after 92 days? (a) Wednesday (b) Sunday (c) Thursday (d) Friday
  35. 35.42 × 4 =
  36. 36.9 × 4 = 3? — what is the missing digit?
  37. 37.?178 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.22 × 4 =
  39. 39.Take 911. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  40. 40.A girl is 12 years old and her brother is 2 years older. How old will her brother be in 3 years?

Answer key

  1. 5
  2. 7
  3. 4
  4. 10
  5. 1980
  6. 45
  7. 62
  8. 1
  9. 44
  10. 111111111
  11. 1089
  12. 38
  13. 946
  14. 236
  15. Thursday
  16. 14
  17. Friday
  18. 15
  19. 7
  20. Sunday
  21. 20
  22. 4
  23. 5
  24. 9000
  25. 8
  26. 81
  27. 3
  28. 222222222
  29. 8
  30. 297
  31. 2040
  32. 14
  33. 6
  34. Thursday
  35. 168
  36. 6
  37. 2
  38. 88
  39. 792
  40. 17

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