Help me please also whoever solves it correct ill mark him brainlist

i just started sorry but i try uh is hard please don't

Step-by-step explanation:

6.45

Step-by-step explanation First you line up the decimal then you add the 4+2=6 So you would write it as 6.

Then you do 2+2=4 so it would be 6.4

Then add the 5 which the answer is 6.45 ( Start from the hundreths place then work up till you get to the ones place when adding)