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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 541 · 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): 21 24 9 | 6 18 30 | 27 12 ?. What is the missing number?
  2. 2.9 × 10 =
  3. 3.Magic trick! Think of 4. Double it, add 4, halve it, then take away 4. What number do you get?
  4. 4.9 × 5 =
  5. 5.The 8th of a month is a Monday. What day is the 25th of the same month? (a) Wednesday (b) Thursday (c) Sunday (d) Friday
  6. 6.9 × 4 =
  7. 7.30 × 100 =
  8. 8.49 × 4 =
  9. 9.10 × 4 =
  10. 10.9 × 7 = ?3 — what is the missing digit?
  11. 11.1 + 2 + 3 + … + 31 =
  12. 12.Double 57 =
  13. 13.9 × 2 = 1? — what is the missing digit?
  14. 14.9 × 5 = 4? — what is the missing digit?
  15. 15.693 + 396 =
  16. 16.1 × 9 =
  17. 17.1 + 2 + 3 + … + 100 =
  18. 18.79 × 100 =
  19. 19.Take 15 and take away the sum of its digits. What do you get?
  20. 20.1 + 2 + 3 + … + 85 =
  21. 21.9 × 2 =
  22. 22.123 × 8 + 3 =
  23. 23.32 × 4 =
  24. 24.6 × 4 =
  25. 25.Magic trick! Think of 9. Double it, add 12, halve it, then take away 9. What number do you get?
  26. 26.You have 11 coins. Each coin is ₹1 or ₹2, and together they make ₹18. How many ₹2 coins do you have?
  27. 27.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
  28. 28.Magic square (every row, column and diagonal has the same total): 7 2 9 | 8 6 ? | 3 10 5. What is the missing number?
  29. 29.9 × 7 =
  30. 30.Half of 14 =
  31. 31.12345679 × 54 =
  32. 32.9 × 2 = ?8 — what is the missing digit?
  33. 33.1 + 3 + 5 + … + 37 =
  34. 34.8 × 9 =
  35. 35.Magic square (every row, column and diagonal has the same total): ? 3 24 | 21 15 9 | 6 27 12. What is the missing number?
  36. 36.Think of 15. Multiply it by 3, then add 8. What number do you end with?
  37. 37.The ages of two twins add up to 20. How old is each twin?
  38. 38.What comes next? 8, 15, 22, 29, ? (a) 43 (b) 37 (c) 29 (d) 36
  39. 39.198 + 891 =
  40. 40.98 × 100 =

Answer key

  1. 15
  2. 90
  3. 2
  4. 45
  5. Thursday
  6. 36
  7. 3000
  8. 196
  9. 40
  10. 6
  11. 496
  12. 114
  13. 8
  14. 5
  15. 1089
  16. 9
  17. 5050
  18. 7900
  19. 9
  20. 3655
  21. 18
  22. 987
  23. 128
  24. 24
  25. 6
  26. 7
  27. 594
  28. 4
  29. 63
  30. 7
  31. 666666666
  32. 1
  33. 361
  34. 72
  35. 18
  36. 53
  37. 10
  38. 36
  39. 1089
  40. 9800

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