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Which of these numbers is correctly written in standard form?

Class 7Standard FormNumber System

A $3.4 \times 1 0^{5}$
B $34 \times 1 0^{4}$
C $0.34 \times 1 0^{6}$
D $3.4 \times 5^{10}$

Step-by-Step Solution

Standard form needs

1 <= k < 10

and a power of 10. Only

3.4 \times 1 0^{5}

qualifies; 34 and 0.34 are out of range and

5^{10}

is not a power of 10.

Answer: A)

3.4 \times 1 0^{5}

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