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Add and subtract with scientific notation $1,99 \times 10^{-26}+1,67 \times 10^{-27}-2,79 \times 10^{-25}=?$
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Step 1: Make all the exponents the same To add or subtract numbers in scientific notation we must make all the exponents the same:

$$\begin{array}{l} 1,99 \times 10^{-26}=0,199 \times 10^{-25} \text { and } \\ 1,67 \times 10^{-27}=0,0167 \times 10^{-25} \end{array}$$

Step 2 : Carry out the addition and subtraction Now that the exponents are the same we can simply add or subtract the $N$ part of each number:

$$0,199+0,0167-2,79=-2,5743$$

Step 3: Write the final answer To get the final answer we put the common exponent back:

$$-2,5743 \times 10^{-25}$$

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