The correct response is:
The sum of 4 tens and 9 tens is 13 tens, which is regrouped as 1 hundred and 3 tens.
This explains why Silvio placed a number above the 1 in 142 during addition. When adding the tens place (40 + 90), you get 130, which consists of 1 hundred and 3 tens. Therefore, the 1 was carried over to the hundreds place.