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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 64 · 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. 1.2 × 9 =
  2. 2.25 × ? = 25000
  3. 3.Half of 48 =
  4. 4.693 + 396 =
  5. 5.22 × 4 =
  6. 6.Half of 56 =
  7. 7.Magic square (every row, column and diagonal has the same total): 10 3 ? | 5 7 9 | 6 11 4. What is the missing number?
  8. 8.9 × 7 = 6? — what is the missing digit?
  9. 9.If today is Saturday, what day was it 15 days ago? (a) Saturday (b) Friday (c) Monday (d) Thursday
  10. 10.44 × ? = 44000
  11. 11.A girl is 7 years old and her brother is 3 years older. How old will her brother be in 4 years?
  12. 12.Take 13 and take away the sum of its digits. What do you get?
  13. 13.Magic square (every row, column and diagonal has the same total): 15 36 21 | 30 ? 18 | 27 12 33. What is the missing number?
  14. 14.9 × 8 =
  15. 15.1 + 2 + 3 + … + 31 =
  16. 16.Half of 106 =
  17. 17.37 × 3 =
  18. 18.5 × 9 =
  19. 19.1 + 3 + 5 + … + 33 =
  20. 20.9 × 5 = ?5 — what is the missing digit?
  21. 21.41 × 4 =
  22. 22.23 × 1000 =
  23. 23.6 × 9 =
  24. 24.9 × 2 =
  25. 25.If today is Monday, what day will it be after 64 days? (a) Tuesday (b) Monday (c) Wednesday (d) Friday
  26. 26.Take 430. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  27. 27.Magic square (every row, column and diagonal has the same total): 4 3 ? | 9 5 1 | 2 7 6. What is the missing number?
  28. 28.9 × 2 = ?8 — what is the missing digit?
  29. 29.You have 15 coins. Each coin is ₹1 or ₹2, and together they make ₹20. How many ₹2 coins do you have?
  30. 30.Magic trick! Think of 13. Double it, add 12, halve it, then take away 13. What number do you get?
  31. 31.3 × 9 =
  32. 32.Take 860. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  33. 33.What comes next? 17, 25, 33, 41, ? (a) 50 (b) 49 (c) 57 (d) 41
  34. 34.9 × 7 = ?3 — what is the missing digit?
  35. 35.Double 66 =
  36. 36.789 × 10 =
  37. 37.If today is Thursday, what day was it 35 days ago? (a) Sunday (b) Thursday (c) Wednesday (d) Friday
  38. 38.?914 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.Double 82 =
  40. 40.12345679 × 81 =

Answer key

  1. 18
  2. 1000
  3. 24
  4. 1089
  5. 88
  6. 28
  7. 8
  8. 3
  9. Friday
  10. 1000
  11. 14
  12. 9
  13. 24
  14. 72
  15. 496
  16. 53
  17. 111
  18. 45
  19. 289
  20. 4
  21. 164
  22. 23000
  23. 54
  24. 18
  25. Tuesday
  26. 396
  27. 8
  28. 1
  29. 5
  30. 6
  31. 27
  32. 792
  33. 49
  34. 6
  35. 132
  36. 7890
  37. Thursday
  38. 4
  39. 164
  40. 999999999

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