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in adding scientific notations you have to make their exponents the same then add the numbers. after you add coppy th x 10 and its exponent

ex.

1.25 x 10e10 + 7.5 x 10e9

=1.25 x 10e10 + 0.75 x10e10(you can see that the decimal point is move to the left so that its exponent will be equal)

=2.0 x 10e10(final ans.)

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Q: What are the rules in adding numbers in scientific notation?
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