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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 719 · 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.Think of 13. Multiply it by 2, then add 1. What number do you end with?
  2. 2.9 × 4 = 3? — what is the missing digit?
  3. 3.Magic square (every row, column and diagonal has the same total): 13 ? 11 | 8 10 12 | 9 14 7. What is the missing number?
  4. 4.1 + 2 + 3 + … + 90 =
  5. 5.49 × 4 =
  6. 6.9 × 9 =
  7. 7.74 × 100 =
  8. 8.198 + 891 =
  9. 9.Half of 132 =
  10. 10.34 × ? = 34000
  11. 11.9 × 9 = ?1 — what is the missing digit?
  12. 12.341 × ? = 3410
  13. 13.1 + 3 + 5 + … + 31 =
  14. 14.What comes next? 3, 6, 12, 24, ? (a) 42 (b) 48 (c) 36 (d) 49
  15. 15.26 × 100 =
  16. 16.171? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.9 × 6 =
  18. 18.I thought of a number, added 3 and then doubled it. I got 38. What was my number?
  19. 19.Magic square (every row, column and diagonal has the same total): ? 12 7 | 6 10 14 | 13 8 9. What is the missing number?
  20. 20.9 × 5 = ?5 — what is the missing digit?
  21. 21.?821 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.You have 9 coins. Each coin is ₹1 or ₹2, and together they make ₹12. How many ₹2 coins do you have?
  23. 23.1 + 2 + 3 + … + 96 =
  24. 24.1 + 3 + 5 + … + 49 =
  25. 25.If today is Thursday, what day will it be after 77 days? (a) Thursday (b) Sunday (c) Friday (d) Wednesday
  26. 26.8 × 9 =
  27. 27.286 × 10 =
  28. 28.Double 95 =
  29. 29.I thought of a number, added 3 and then doubled it. I got 40. What was my number?
  30. 30.9 × 7 = ?3 — what is the missing digit?
  31. 31.9 × 8 = 7? — what is the missing digit?
  32. 32.29 × 4 =
  33. 33.19 × 4 =
  34. 34.2?04 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.12345678 × 8 + 8 =
  36. 36.6 × 9 =
  37. 37.693 + 396 =
  38. 38.1 × 9 =
  39. 39.1 + 3 + 5 + … + 19 =
  40. 40.377 × 10 =

Answer key

  1. 27
  2. 6
  3. 6
  4. 4095
  5. 196
  6. 81
  7. 7400
  8. 1089
  9. 66
  10. 1000
  11. 8
  12. 10
  13. 256
  14. 48
  15. 2600
  16. 9
  17. 54
  18. 16
  19. 11
  20. 4
  21. 7
  22. 3
  23. 4656
  24. 625
  25. Thursday
  26. 72
  27. 2860
  28. 190
  29. 17
  30. 6
  31. 2
  32. 116
  33. 76
  34. 3
  35. 98765432
  36. 54
  37. 1089
  38. 9
  39. 100
  40. 3770

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