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1/2=4/8=1/2
yea
If you are adding or subtracting two numbers in scientific notation, you must rewrite one of the numbers to the same power of ten as the other, before performing the addition (or subtraction).
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To duplicate is to make an exact copy. (Ex. A double. A duplicate copy of the report looks exactly the same as the first.) To replicate is to make a similar copy. (Ex. A replica, or a knock off purse is similar to the real item but not the same)