Question

How do you write the number 420000 in standard form?

Answer 1

Answer:

4.2×105

Explanation:

A number expressed in standard form is.

¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯∣∣∣22a×10n22∣∣∣−−−−−−−−−−−−

where −1≤a<10 and n is an integer

We have to write 420000 as a number between 1 and 10

The decimal point in 420000 is at 420000∙

and we want 4∙20000 so that it is a value between 1 and 10

To place the decimal point back to it's original position means moving it 5 places to the right, effectively multiplying by 100000

⇒4.2×100000=4.2×105← in standard form

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Answer 2

Answer: 4.2 ×10∧5 (10 to the fifth power)

Step-by-step explanation: