5.905 times 100.04 is closest to what?

5.905 × 100.04
≈ 5.91 × 100
= 591

590.7362.

590.74

　
This is an odd way of asking. It's definitely closest to whatever 5.905 * 100.04 is.

But I think you're probably being asked to approximate this. So it makes little sense to ask for the number it's closest to. You just want an answer that is close to it.

Usually, I'd round 5.905 to 6. But since 100.04 rounds to 100, it's not really necessary to round the first number at all, since we can easily multiply any number by 100:

5.905 * 100.04 ≈ 5.905 * 100 = 590.5

6x100

5.905 times 100.04
= 590.5 + 0.2362
= 590.7362

5.905 times 100.04 ≈
6 * 100 =
600