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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 73 · 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 6. What is that number?
  2. 2.7 × 9 =
  3. 3.Magic square (every row, column and diagonal has the same total): 16 11 ? | 9 13 17 | 14 15 10. What is the missing number?
  4. 4.55 × 4 =
  5. 5.19 × 4 =
  6. 6.51?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.Half of 12 =
  8. 8.21 × 4 =
  9. 9.3 × 9 =
  10. 10.I thought of a number, added 2 and then doubled it. I got 10. What was my number?
  11. 11.Magic square (every row, column and diagonal has the same total): 18 3 24 | 21 15 9 | 6 ? 12. What is the missing number?
  12. 12.Half of 32 =
  13. 13.1 × 9 =
  14. 14.392 × 10 =
  15. 15.9 × 3 = 2? — what is the missing digit?
  16. 16.Magic square (every row, column and diagonal has the same total): 17 ? 21 | 19 15 11 | 9 23 13. What is the missing number?
  17. 17.Double 23 =
  18. 18.Take 539. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  19. 19.Magic square (every row, column and diagonal has the same total): 11 12 ? | 6 10 14 | 13 8 9. What is the missing number?
  20. 20.What comes next? 9, 16, 23, 30, ? (a) 37 (b) 38 (c) 30 (d) 44
  21. 21.9 × 6 =
  22. 22.8 × 9 =
  23. 23.72 × 100 =
  24. 24.6 × 9 =
  25. 25.Magic square (every row, column and diagonal has the same total): ? 5 10 | 7 9 11 | 8 13 6. What is the missing number?
  26. 26.A piggy bank has 2 coins of ₹5 and 3 coins of ₹2. How many rupees are in it?
  27. 27.A girl is 11 years old and her brother is 5 years older. How old will her brother be in 8 years?
  28. 28.598 × 10 =
  29. 29.53 × 4 =
  30. 30.Half of 56 =
  31. 31.Take 48 and take away the sum of its digits. What do you get?
  32. 32.9 × 9 = ?1 — what is the missing digit?
  33. 33.1 + 3 + 5 + … + 45 =
  34. 34.9 × 2 = ?8 — what is the missing digit?
  35. 35.40 × 4 =
  36. 36.123 × 9 + 4 =
  37. 37.9 × 9 = 8? — what is the missing digit?
  38. 38.37 × 3 =
  39. 39.Odd one out: which number is NOT in the 6 times table? (a) 12 (b) 13 (c) 18 (d) 30
  40. 40.What comes next? 11, 15, 19, 23, ? (a) 31 (b) 28 (c) 23 (d) 27

Answer key

  1. 693
  2. 63
  3. 12
  4. 220
  5. 76
  6. 1
  7. 6
  8. 84
  9. 27
  10. 3
  11. 27
  12. 16
  13. 9
  14. 3920
  15. 7
  16. 7
  17. 46
  18. 396
  19. 7
  20. 37
  21. 54
  22. 72
  23. 7200
  24. 54
  25. 12
  26. 16
  27. 24
  28. 5980
  29. 212
  30. 28
  31. 36
  32. 8
  33. 529
  34. 1
  35. 160
  36. 1111
  37. 1
  38. 111
  39. 13
  40. 27

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