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7.5.1. Modular Addition, Subtraction and Multiplication
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11 questions on this section. Wrong answers show you what to read again.
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Mixed questions from across the chapter. Your answers get marked.
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Flashcard drill
2 cards from this lesson. Good the night before a test.
Try these first
- 1.
What is 8 mod 5?
Hint
Think about how many times 5 fits into 8.
- 2.
Is -4 mod 3 equal to 2 or 0?
Hint
When calculating negative mod, visualize moving in the opposite direction.
- 3.
What is 10 mod 3?
- 1
- 2
- 0
Hint
Subtract multiples of 3 from 10.
- 4.
True or False: Division is well-defined in modular arithmetic.
- True
- False
Hint
Consider cases where division produces a fraction.
- 5.
Calculate (15 * 19) mod 7 using properties of modular arithmetic.
Hint
Reduce each number first!
- 6.
Using the square and multiply method, compute (4^12) mod 11.
Hint
Square and reduce at each step.
Exercises
Total Questions
2
Estimated Time
4 min
Passing Score
70%
Instructions
- Read each question carefully
- You can use hints if you need help
- Complete all questions before submitting
4 more questions available
Enrol freeQuiz
Total Questions
2
Estimated Time
4 min
Passing Score
70%
Instructions
- Read each question carefully
- You can use hints if you need help
- Complete all questions before submitting
1 more question available
Enrol freeChallenge Problems
Total Questions
2
Estimated Time
4 min
Passing Score
70%
Instructions
- Read each question carefully
- You can use hints if you need help
- Complete all questions before submitting