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Addition and Subtraction of numbers in Scientific Notation
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Steps to add or subtract numbers in scientific notation are as follows:
1) Adjust the smaller number so that it has the same power of ten as the larger number.
2) Add or subtract the coefficients, leaving the power of ten as is.

Add 6.7 x 107 to 5.61 x 105.

Step 1.
5.61 x 105 is the smaller number. So adjust it so that it's to a power of 7.

Adding 6.7 x 10<sup>7</sup> to 5.61 x 10<sup>5</sup>
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