Question

Find all replacements (less than the modulus. for the question mark that make the statement true. 7 + ? ≡ 4 (mod 8)

Answer 1

Less than the modulus? Like the question mark should be less than 8?

Answer 2

7 + ? gives you a remainder 4 when divided by 8.

Answer 3

Find all replacements (less than the modulus) for the question mark that make the statement true.

Answer 4

Let's check step by step.

7 + 0 gives you a remainder of 7.
7 + 1 gives you a remainder of 0.
7 + 2 gives you a remainder of 1.

Keep going. What gives you a remainder of 4?

Answer 5

7+5