This Adding Decimals (Tenths Place) worksheet is an excellent starting point for 4th graders learning to align values in base-10 arithmetic.

How to Solve Decimals - Addition

The golden rule of decimal arithmetic is to line up the decimal points vertically! Once the dots are stacked directly on top of each other, simply add the columns from right to left just like you would with whole numbers. Bring the decimal point straight down into your answer.

You can view the preview of this worksheet below, or download the full high-resolution PDF along with the answer key for easy grading.