Doing math with paper and pencil can come in real handy, so make sure you're comfortable multiplying decimals by hand. After all, you don't want the calculator to be a crutch!
If you want to multiply a decimal by a whole number, just ignore the decimal point and multiply like normal! Then, bring the decimal point back for the answer. This tutorial shows you the entire process step-by-step.
When you multiply a decimal and a whole number, removing the decimal point can make multiplying easier, but where does the decimal point go when you want to get your answer? In this tutorial, you'll see how to estimate the location of the decimal point after you multiply!