This video explains how to easy add decimals. Adding decimals can seem to be a tedious job, and a single mistake can result in a completely different number. In reality, it is quite easy, and with a good method and some practice it can be done quickly. Write the two sets of numbers out, lining them up in columns. Keep the decimal points on top of each other and line up the non-decimals with non-decimals and the decimals with decimals. Start at the right-most column and add it up. If it becomes more than 9, remember to write the next digit in a third row (perhaps in a smaller notation). Add the second right-most column up with any extra number from the first column. Continue the process, remembering to include extra digits from previous columns.