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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 742 · 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. 1.97 × ? = 9700
  2. 2.Odd one out: which number is NOT in the 7 times table? (a) 35 (b) 28 (c) 34 (d) 56
  3. 3.1234 × 9 + 5 =
  4. 4.123456 × 9 + 7 =
  5. 5.Double 81 =
  6. 6.9 × 4 = 3? — what is the missing digit?
  7. 7.Magic square (every row, column and diagonal has the same total): 29 14 17 | ? 20 32 | 23 26 11. What is the missing number?
  8. 8.Magic trick! Think of 5. Double it, add 14, halve it, then take away 5. What number do you get?
  9. 9.Magic trick! Think of 12. Double it, add 12, halve it, then take away 12. What number do you get?
  10. 10.Magic square (every row, column and diagonal has the same total): 2 ? 6 | 9 5 1 | 4 3 8. What is the missing number?
  11. 11.The 7th of a month is a Saturday. What day is the 29th of the same month? (a) Saturday (b) Monday (c) Sunday (d) Wednesday
  12. 12.41 × 4 =
  13. 13.27 × 4 =
  14. 14.Magic square (every row, column and diagonal has the same total): 24 ? 18 | 9 15 21 | 12 27 6. What is the missing number?
  15. 15.9 × 9 = ?1 — what is the missing digit?
  16. 16.9 × 6 = ?4 — what is the missing digit?
  17. 17.9 × 5 = ?5 — what is the missing digit?
  18. 18.12345679 × 18 =
  19. 19.The 5th of a month is a Tuesday. What day is the 28th of the same month? (a) Sunday (b) Wednesday (c) Thursday (d) Friday
  20. 20.28 × ? = 28000
  21. 21.7 × 4 =
  22. 22.Half of 174 =
  23. 23.What comes next? 25, 36, 49, 64, ? (a) 83 (b) 82 (c) 79 (d) 81
  24. 24.9 × 10 = ?0 — what is the missing digit?
  25. 25.9 × 9 = 8? — what is the missing digit?
  26. 26.50 × 1000 =
  27. 27.Odd one out: which number is NOT in the 7 times table? (a) 42 (b) 28 (c) 21 (d) 19
  28. 28.22 × ? = 22000
  29. 29.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  30. 30.A piggy bank has 12 coins of ₹5 and 12 coins of ₹2. How many rupees are in it?
  31. 31.Magic square (every row, column and diagonal has the same total): 6 21 18 | 27 ? 3 | 12 9 24. What is the missing number?
  32. 32.31 × 4 =
  33. 33.The ages of two twins add up to 12. How old is each twin?
  34. 34.If today is Monday, what day was it 9 days ago? (a) Sunday (b) Tuesday (c) Saturday (d) Friday
  35. 35.What comes next? 2, 4, 8, 16, ? (a) 33 (b) 32 (c) 24 (d) 28
  36. 36.1234 × 8 + 4 =
  37. 37.8 × 9 =
  38. 38.9 × 2 = ?8 — what is the missing digit?
  39. 39.In 4 years a boy will be 17 years old. How old was he 2 years ago?
  40. 40.9 × 3 =

Answer key

  1. 100
  2. 34
  3. 11111
  4. 1111111
  5. 162
  6. 6
  7. 8
  8. 7
  9. 6
  10. 7
  11. Sunday
  12. 164
  13. 108
  14. 3
  15. 8
  16. 5
  17. 4
  18. 222222222
  19. Thursday
  20. 1000
  21. 28
  22. 87
  23. 81
  24. 9
  25. 1
  26. 50000
  27. 19
  28. 1000
  29. 693
  30. 84
  31. 15
  32. 124
  33. 6
  34. Saturday
  35. 32
  36. 9876
  37. 72
  38. 1
  39. 11
  40. 27

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