You need to line up decimals for additional and subtraction. For multiplication, you don't need to line them up - in fact, it would serve no useful purpose.
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line up the numbers and decimals multiply regularly then bring the decimal down
line up the decimals together
Yes. Line up them up when you're adding, too.
39.63 +42.35 ------------ 81.98 Just line up the decimals and then add.
line up the demials