Answer: When we add decimals, we have to line up the decimal point and decimal places. This is because we have to add the tens to the tens, the ones to the ones, the tenths to the tenths, the hundredths to the hundredths, and so on.
It is also important to line up decimal points even if you aren’t adding because it is much easier to make a mistake if they aren’t lined up together. One decimal not lined up can screw the whole thing up.
