# Write $1000000 + 200000 + 70000$ in scientific notation.A.$1.27 \times {10^5}$B.$1.27 \times {10^6}$ C.$3.7 \times {10^6}$D.$1.9 \times {10^5}$

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Hint:Scientific notation is a way of writing down very large or very small numbers easily.
${10^3} = 1000$, so $4 \times {10^3} = 4000$ . So $4000$ can be written as $4 \times {10^3}$ . This idea can be used to write even larger numbers down easily in scientific notation.
The rules when writing a number in scientific notation is that first you write down a number between $1$ and $10$, then you multiply it by $10$ to the power of a number.
Scientific notation =$m \times {10^n}$ where, $1 \leqslant m < 10$.

The given number is $1000000 + 200000 + 70000$.We need to write the number in scientific notation.
We know that, if we need to write one number in scientific notation then we first need to write a number between $1$ and $10$ then multiply it by $10$ to the power of a number.
Thus, $1000000 + 200000 + 70000 = 1270000$
So, for expressing $1270000$ in the scientific notation we first need to write a number between 1 and $10$ then multiply it by $10$ to the power of a number.
That is, we can express $1270000$ as $1.27$ multiplied by $10$ to the power 6.
i.e.$1270000 = 1.27 \times {10^6}$
Scientific notation of $1000000 + 200000 + 70000$ is $1.27 \times {10^6}$.
Small numbers can also be written in scientific notation. However, instead of the index being positive (in the above example, the index was $3$), it will be negative. The rules when writing a number in scientific notation is that first you write down a number between 1 and $10$, then you multiply it by $10$ to the power of a number.