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There are infinitely many natural numbers, right? 1, 2, 3, 4, 5, 6, ...., ∞ are all natural numbers.

We can now multiply all natural numbers with (-1) to get another sequence of infinite numbers: -1, -2, -3, -4, -5, -6, ..., -∞

So how many whole numbers are there? The whole numbers are those: -∞, ..., -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, ..., ∞
Looking at what we previously defined, would you say there are 2 * ∞ whole numbers? After all, it's the amount of natural numbers [∞] + the amount of natural numbers multiplied by (-1) [∞], which is the result of ∞ + ∞, isn't it?

But wait a second, are there really exactly infinite natural numbers? We could split the natural numbers into all even (2, 4, 6, 8, 10,...) and all uneven (1, 3, 5, 7, 9,...) numbers. But there are infinitely many even and infinitely many uneven numbers as well. So are there actually 2 * ∞ many natural numbers?`

BUT WAIT, what if we split the even numbers up even further? How about all numbers divisible by four (4, 8, 12, 16, 20, 24,...) and all numbers not divisible by four (6, 10, 14, 18, 22,...). Well, there are again infinitely many whole numbers divisible by four and infinitely many numbers not divisible by four. So are there 2 * ∞ many even numbers and therefore 3 * ∞ many natural numbers (2 * ∞ from even, 1 * ∞ from uneven)?

As you can see, we can divide one infinity into infinitely many infinities. Multiples of ∞ aren't really any meaningful - they are just ∞ again!