Decimals re-cap

Locate the digit in the place you are rounding off to

Look at the NEXT digit after the place you are rounding to... if it is 4 or less, round down. If it is a 5 or more, round up.

Read place values from largest to smallest (left to right), until you find one that is different in each number

The number with the higher digit in that place is the larger number

Set up a vertical addition, making sure the decimal points line up

Do the addition as normal, making sure the decimal point in your answer is in line too!

Set up a vertical subtraction, making sure the decimal points line up

Do the subtraction as normal, making sure the decimal point in your answer is lined up too.

Multiply the numbers as usual

The total number of decimal places in the original sum must be the total number of decimal places in your answer