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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 229 · 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. 1.9 × 10 = ?0 — what is the missing digit?
  2. 2.35 × 4 =
  3. 3.A girl is 6 years old and her brother is 2 years older. How old will her brother be in 4 years?
  4. 4.Do the 1089 trick with 593: reverse and subtract, then reverse that answer and add. What do you get?
  5. 5.Magic trick! Think of 3. Double it, add 4, halve it, then take away 3. What number do you get?
  6. 6.625 × ? = 6250
  7. 7.I thought of a number, multiplied it by 2 and added 6. I got 12. What was my number?
  8. 8.12345 × 9 + 6 =
  9. 9.6 × 9 =
  10. 10.Take 40 and take away the sum of its digits. What do you get?
  11. 11.9 × 1 =
  12. 12.9 × 5 = 4? — what is the missing digit?
  13. 13.?340 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.Magic square (every row, column and diagonal has the same total): 9 4 11 | ? 8 6 | 5 12 7. What is the missing number?
  15. 15.Magic square (every row, column and diagonal has the same total): 5 ? 9 | 12 8 4 | 7 6 11. What is the missing number?
  16. 16.The 6th of a month is a Sunday. What day is the 25th of the same month? (a) Monday (b) Friday (c) Thursday (d) Saturday
  17. 17.9 × 4 = ?6 — what is the missing digit?
  18. 18.9 × 3 = ?7 — what is the missing digit?
  19. 19.The 6th of a month is a Sunday. What day is the 23rd of the same month? (a) Thursday (b) Tuesday (c) Wednesday (d) Saturday
  20. 20.20 × ? = 20000
  21. 21.Half of 114 =
  22. 22.Double 95 =
  23. 23.908 × 10 =
  24. 24.32 × 1000 =
  25. 25.Magic square (every row, column and diagonal has the same total): 3 10 5 | ? 6 4 | 7 2 9. What is the missing number?
  26. 26.9 × 3 = 2? — what is the missing digit?
  27. 27.21 × 4 =
  28. 28.9 × 6 = 5? — what is the missing digit?
  29. 29.Half of 72 =
  30. 30.Odd one out: which number is NOT in the 6 times table? (a) 30 (b) 24 (c) 25 (d) 12
  31. 31.Magic square (every row, column and diagonal has the same total): 7 ? 3 | 2 6 10 | 9 4 5. What is the missing number?
  32. 32.In 6 years a boy will be 20 years old. How old was he 2 years ago?
  33. 33.A piggy bank has 12 coins of ₹5 and 14 coins of ₹2. How many rupees are in it?
  34. 34.?836 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.4 × 9 =
  36. 36.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  37. 37.?260 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.I thought of a number, multiplied it by 2 and added 4. I got 16. What was my number?
  39. 39.92 × ? = 920
  40. 40.9 × 2 = 1? — what is the missing digit?

Answer key

  1. 9
  2. 140
  3. 12
  4. 1089
  5. 2
  6. 10
  7. 3
  8. 111111
  9. 54
  10. 36
  11. 9
  12. 5
  13. 2
  14. 10
  15. 10
  16. Friday
  17. 3
  18. 2
  19. Wednesday
  20. 1000
  21. 57
  22. 190
  23. 9080
  24. 32000
  25. 8
  26. 7
  27. 84
  28. 4
  29. 36
  30. 25
  31. 8
  32. 12
  33. 88
  34. 1
  35. 36
  36. 297
  37. 1
  38. 6
  39. 10
  40. 8

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