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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 507 · 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. 1.1 × 9 =
  2. 2.9 × 5 =
  3. 3.The 6th of a month is a Friday. What day is the 30th of the same month? (a) Tuesday (b) Sunday (c) Thursday (d) Monday
  4. 4.2 × 9 =
  5. 5.You have 8 coins. Each coin is ₹1 or ₹2, and together they make ₹12. How many ₹2 coins do you have?
  6. 6.9 × 3 = 2? — what is the missing digit?
  7. 7.1 + 3 + 5 + … + 43 =
  8. 8.854 × 10 =
  9. 9.9 × 1 =
  10. 10.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
  11. 11.17 × 4 =
  12. 12.37 × 15 =
  13. 13.10 × 9 =
  14. 14.I thought of a number, added 3 and then doubled it. I got 16. What was my number?
  15. 15.12 × 8 + 2 =
  16. 16.I thought of a number, multiplied it by 4 and added 8. I got 64. What was my number?
  17. 17.Double 63 =
  18. 18.5 × 9 =
  19. 19.I thought of a number, multiplied it by 5 and added 7. I got 32. What was my number?
  20. 20.Think of 14. Multiply it by 4, then add 5. What number do you end with?
  21. 21.A girl is 7 years old and her brother is 6 years older. How old will her brother be in 6 years?
  22. 22.Double 44 =
  23. 23.9 × 8 =
  24. 24.8 × 9 =
  25. 25.396 + 693 =
  26. 26.9 × 10 = 9? — what is the missing digit?
  27. 27.9 × 6 = ?4 — what is the missing digit?
  28. 28.111111 × 111111 =
  29. 29.Magic square (every row, column and diagonal has the same total): 15 10 17 | 16 ? 12 | 11 18 13. What is the missing number?
  30. 30.Odd one out: which number is NOT in the 6 times table? (a) 18 (b) 24 (c) 51 (d) 12
  31. 31.9 × 5 = 4? — what is the missing digit?
  32. 32.Magic square (every row, column and diagonal has the same total): ? 15 8 | 9 11 13 | 14 7 12. What is the missing number?
  33. 33.What comes next? 9, 16, 25, 36, ? (a) 49 (b) 47 (c) 50 (d) 51
  34. 34.The ages of two twins add up to 12. How old is each twin?
  35. 35.34 × 100 =
  36. 36.I thought of a number, multiplied it by 3 and added 7. I got 37. What was my number?
  37. 37.Think of 5. Multiply it by 2, then add 9. What number do you end with?
  38. 38.What comes next? 1, 4, 9, 16, ? (a) 27 (b) 26 (c) 25 (d) 23
  39. 39.Half of 86 =
  40. 40.6 × 9 =

Answer key

  1. 9
  2. 45
  3. Monday
  4. 18
  5. 4
  6. 7
  7. 484
  8. 8540
  9. 9
  10. 198
  11. 68
  12. 555
  13. 90
  14. 5
  15. 98
  16. 14
  17. 126
  18. 45
  19. 5
  20. 61
  21. 19
  22. 88
  23. 72
  24. 72
  25. 1089
  26. 0
  27. 5
  28. 12345654321
  29. 14
  30. 51
  31. 5
  32. 10
  33. 49
  34. 6
  35. 3400
  36. 10
  37. 19
  38. 25
  39. 43
  40. 54

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