Answer:
To regroup the sum, we need to first break them in tens and ones and then regroup them according to their place values.
Given sum:- 64+43, where 64 can be written as 60+4 and 43 can be written as 40+3, now regroup tens and ones particularly , we get
64+43
=60+4+40+3 [breaking]
=60+40+4+3 [combine according to the corresponding place values ]
=(60+40)+(4+3) [put parenthesis]
=100+7=107
