# [Quiz] Questions on scientific notation for numbers for 5th grade (set 2)

Welcome to Math Quiz number 31. These are grade (class) 5 questions based on the conversion of big numbers and decimal numbers from standard format to scientific notation and vice versa. Also, it contains questions on mathematical operations using scientific notation. These questions test student’s basic understanding of the scientific notation of numbers. Please do not use a calculator or online tool to answer these questions. Once you submit the quiz, you may see NA at the end of the questions. NA suggests that there is no hint given for that particular question. Have fun!!!

1.
Write the number 0.000045 in scientific notation.

2.
Express $9.6 \times 10^8$ in standard form.

3.
Represent $2.7 \times 10^{-3} \times 6 \times 10^4$ in scientific notation.

4.
Divide $5.8 \times 10^6$ by $2 \times 10^2$ and write the answer in scientific notation.

5.
Express $3.2 \times 10^{-1} \times 7 \times 10^{-2}$ in scientific notation.

6.
What is $2.3 \times 10^5$ + $1.4 \times 10^5$ in scientific notation?

7.
Express 0.00000781 in scientific notation.

8.
What is $5.7 \times 10^3$ - $3.2 \times 10^3$ in scientific notation.

9.
What is $4.2 \times 10^{-2} \times 2.5 \times 10^{-3}$ in scientific notation.

10.
Convert $7.8 \times 10^4$ into standard form.

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