Practice Modular Addition, Subtraction And Multiplication (7.5.1) - Lecture

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9 questions

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2 cards from this section. Quick, good the night before a test.
Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
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Quiz
3 questions · about 2 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What is 8 mod 5?
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Think about how many times 5 fits into 8.
Question 2.
Is -4 mod 3 equal to 2 or 0?
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When calculating negative mod, visualize moving in the opposite direction.
3Question 3.
What is 10 mod 3?
- 1
- 2
- 0
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Subtract multiples of 3 from 10.
4Question 4.
True or False: Division is well-defined in modular arithmetic.
- True
- False
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Consider cases where division produces a fraction.
Question 5.
Calculate (15 * 19) mod 7 using properties of modular arithmetic.
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Reduce each number first!
Question 6.
Using the square and multiply method, compute (4^12) mod 11.
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Square and reduce at each step.

5 more questions in this section. Enroll free to practise them all.