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What do you mean if you mean in multiplication after multiplying move the decimal to the left for how many numbers there were after the decimal point. if you mean in addition or subtraction the you line up the numbers and then the point stays where it was Ex. 2.13 +31.4 --------- 43.53 If you mean in division then the easiest way is to move the decimal point to the right of the divisor however many times you wish and you have to do the same with the dividend and after dividing that you have to replace however many times you move the decimal point
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If you mean make 3.5 into a number that is between 0 and 2 then: Move the decimal of the 3.5 over one place or times it by 10. 10 has 1 zero in it so you move the decimal point over 1 place.
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.
To move "on all fours" would be to crawl on your hands on knees.