Answer
$11.424$
Work Step by Step
$3.12 +6.3+2.004$
Add the thousandths places. $0.004$
Add the hundredths places. $0.02$ + $0.004$ =$0.024$
Add the tenths places. $0.1 + 0.3 =0.4$
$0.4+0.024 = 0.424$
Add the ones places $3+6+2 = 11$
Add this to the decimal places.
$11 + 0.424 = 11.424$