If I cross mutipliy this numbers what will the answer be

If I cross mutiplyed this numbers what will I get

Answers is 3/4 = 6/8 the lowest common denominator is 8 so you would multiple 3/4 by 2/2 giving you 6/8.

No, the OP asked what THEY would get if they cross-multiplied, and that we don't know because they didn't try.

Explain what you think cross-multiplying means, then try that logic on the problem, tell us what you get. We'll dive in from there.