123+456+777+444=(123+777)+(456+444)
=1000+1000=2000
= (123 + 777) + (456 + 444)
= 900 + 900
= 1800
= 16. (28 + 70 + 2)
= 16 . (98 + 2 )
= 16 . 100
= 1600
123+456+777+444
=(123+777)+(456+444)
=900+900=1800
16.28+70.16+2.16
=16(28+70+2)
=16.100=1600