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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 72 · 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 × 6 =
  2. 2.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
  3. 3.2?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.23 × 4 =
  5. 5.9 × 9 =
  6. 6.9 × 6 = 5? — what is the missing digit?
  7. 7.15 × 4 =
  8. 8.Odd one out: which number is NOT in the 9 times table? (a) 18 (b) 27 (c) 45 (d) 32
  9. 9.693 + 396 =
  10. 10.293 × ? = 2930
  11. 11.1 + 3 + 5 + … + 13 =
  12. 12.Take 446. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  13. 13.18 × 4 =
  14. 14.?704 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.If today is Monday, what day was it 56 days ago? (a) Sunday (b) Monday (c) Tuesday (d) Thursday
  16. 16.The ages of two twins add up to 10. How old is each twin?
  17. 17.47 × 4 =
  18. 18.The ages of two twins add up to 30. How old is each twin?
  19. 19.9 × 4 =
  20. 20.2 × 9 =
  21. 21.The ages of two twins add up to 12. How old is each twin?
  22. 22.18 × ? = 18000
  23. 23.Half of 82 =
  24. 24.Double 55 =
  25. 25.Half of 166 =
  26. 26.10 × 1000 =
  27. 27.You have 12 coins. Each coin is ₹1 or ₹2, and together they make ₹21. How many ₹2 coins do you have?
  28. 28.30 × 1000 =
  29. 29.Magic square (every row, column and diagonal has the same total): 2 9 4 | 7 5 ? | 6 1 8. What is the missing number?
  30. 30.10 × 9 =
  31. 31.4 × 9 =
  32. 32.12 × 8 + 2 =
  33. 33.9 × 9 = ?1 — what is the missing digit?
  34. 34.42 × 4 =
  35. 35.41 × 4 =
  36. 36.11 × 4 =
  37. 37.1 + 2 + 3 + … + 6 =
  38. 38.A father is 41 years old and his son is 4. How old was the father when the son was born?
  39. 39.88 × 100 =
  40. 40.1 + 3 + 5 + … + 35 =

Answer key

  1. 54
  2. 891
  3. 7
  4. 92
  5. 81
  6. 4
  7. 60
  8. 32
  9. 1089
  10. 10
  11. 49
  12. 198
  13. 72
  14. 7
  15. Monday
  16. 5
  17. 188
  18. 15
  19. 36
  20. 18
  21. 6
  22. 1000
  23. 41
  24. 110
  25. 83
  26. 10000
  27. 9
  28. 30000
  29. 3
  30. 90
  31. 36
  32. 98
  33. 8
  34. 168
  35. 164
  36. 44
  37. 21
  38. 37
  39. 8800
  40. 324

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