When subtracting scientific notation, you first need to make the exponents the same. The standard is to make the smaller exponent the same as the higher one.
Let's take a look at your given:
This is smaller.
Every time you add to the exponent, you need to move the decimal. So to make it the same, you need to add 1 to the 4 to get 5. Then move the decimal to the left. Your new notation would be:
Then you just line up the decimal as you would before subtracting and just copy the base and exponent.
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=
Let's take a look at your given:
Every time you add to the exponent, you need to move the decimal. So to make it the same, you need to add 1 to the 4 to get 5. Then move the decimal to the left. Your new notation would be:
Then you just line up the decimal as you would before subtracting and just copy the base and exponent.
-
=