One way to solve this is to revert to integers.
Do this by moving the decimal in 1.3 to the right 6 places (indicated by the positive power value) and then 6.8 move the decimal to the right 5 places (same reason)
Now you have 1,300,000 & 680000. Subtract to get 620,000.
Now convert your product to scientific notation again by moving your decimal to the left until you are left with 6.2 x ? The question mark will be 10 to the number of places you moved the decimal. 10^5
We have 6.2 x 10^5.
It is import to note that when the decimal must be moved to the right for values less than one, the power will be negative.
The difference written in scientific notation is 6.2 × 10⁵
Given the expression
1.3x10^6 - 6.8 x 10^5
We are to find the difference and express in scientific notation
1.3x10^6 = 1300000
6.8 x 10^5 = 680000
Taking the difference of the decimals;
1.3x10^6 - 6.8 x 10^5
= 1300000 - 680000
= 620,000
Convert 620,000 into standard form to have:
620,000 = 6.2 × 10⁵
Hence the difference written in scientific notation is 6.2 × 10⁵
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