How do you get 127+376=503

Hi, 127+376=503 because 6 plus 7 equals 13 we leave 3 and we carry the 1, 7 plus 2 equals 9 plus the one that we had before = 10, we leave the 0 and we carry the 1, finally 3 plus 1 equals 4 plus the one that we had before = 5, giving us 503.

6 + 7 = 13

20 + 70 = 90

100 + 300 = 400

The 400 + 90 + 13 = 503