It all depends on what you are multiplying say 6.61 times 40 you move the decimal 2 times to the left and when you are done you move it back the two spaces to get your final answer. If you don't move it or forget it could really mess you up for homework or even in a daily life. So if anything just move it the two spaces and it will have a big chunk of pressure off of your chest so just do it.
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0.30 you move the decimal point over 2 times to the left to get the decimal. You move it over 2 times to the right to get the percent. IE. 5% = 0.05
move decimal over 2 times
1 is actually 100%. Let's say you have a decimal, like 0.74. move the decimal point 2 times to the right and BOOM! You have a percent, 74%. Since 1 is written as the decimal 1.00, move the decimal point 2 times to the right and you have 100%. From, Legit Answers
you move the decimal 2 spaces back to see the decimal of a percent or a number
Take off the percent sign and move the decimal 2 times to the left. E.g. 34% = 0.34