When adding or sbtracting numbers in a power-of-ten format, be sure that the power of ten is the same for each number. Then separate the multipliers, perform the required operation, and apply the same power of ten to the result.
To perform addition or subtraction using powers of ten, the power of ten must be the same for each term
A x 10^n + B x 10^n = (A + B) x 10^n
A x 10^n - B x 10^n = (A - B) x 10^n
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