Wow... This is surprising to me. How can it know all these different additions? Has it been trained on so much data that it came across 292+25=317 and is able

Wow... This is surprising to me. How can it know all these different additions? Has it been trained on so much data that it came across 292+25=317 and is able to summon it in a situation like this? Or did it learn to actually add decimal numbers (the way we do it). Does it always work or what’s the success rate? Did you try with 5-digit numbers and/or negative numbers?