The sum of 546 and 200 is 746. There’s really not much to this. If you’re adding nothing to 46, it is still 46 in the end. The only real change is the hundreds place. You can figure this out by just adding 2 and 5 together, which is 7. Putting it in order, the answer reads 746.
This is simple arithmetic. However, to some, it’s not so easy. The easiest way to solve this is to do the ones place, then the tens place, then the hundreds place. As explained earlier, that makes it incredibly simple to make it all work out in the end. Otherwise, there’s nothing more I can say about this answer that would make sense.