`3)`
`a) 45 . 6
`= ( 40 + 5 ) . 6`
`= 40 . 6 + 5 . 6`
`= 240 + 30`
`= 270`
------------------------------------
`b) 130 . 12`
`= ( 100 + 30 ) . 12`
`= 100 . 12 + 30 . 12`
`= 1200 + 360`
`= 1560`
------------------------------------
`c)79 . 101`
`= 79 . ( 100 + 1)`
`=79 . 100 + 79 . 1`
`= 7900 + 79`
`= 7979`
------------------------------------
`d)75 . 1002`
`= 75 . ( 1000 + 2)`
`= 75 . 1000 + 75 . 2`
`= 75000 + 150`
`= 75150`
------------------------------------
`4)`
`19 . ( 2 . 2 )`
`= (19 . 2) . 2`
`= 38 . 2`
`= 76`
------------------------------------
b) `25 . 28`
`= 25 . ( 7.4)`
`= (25 . 4 ) . 7`
`= 100 . 7`
`= 700`
------------------------------------
`c) 125 . 16`
`= 125 . ( 8.2)`
`=( 125. 8 ) . 2`
`= 1000 . 2`
`= 2000`
---------------------------------------
`d)375 . 8`
`= ( 125 . 3) . 8`
`= ( 125 . 8) . 3`
`= 1000 . 3`
`=3000`
