This is because the 1 occupies a placeholder that is greater by a factor of 10 (hence 1*10 = 10). For example, if we wanted to add 48+26,
48
26
-------
14
1
48
26
-------
74
Here, the 1 occupies the tens place, so it represents a 10.
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If you are talking about the 6th numerical row (1 5 10 10 5 1, technically 5th row because Pascal's triangle starts with the 0th row), it does not appear to be a multiple of 11, but after regrouping or simplifying, it is. We have 1 5 10 10 5 1 which is equivalent to 105 + 5*104 + 10*103 + 10*102 + 5*101 + 1 = 161051. This is equal to 115.
Regrouping simply means putting the 2+ answers into a group and subtracting all the answers together.
1 1/4
It can be. 1/10 is equivalent to 2/20
453 - 618 in regrouping = -165