How do you write #42,000# in scientific notation?

1 Answer
Aug 30, 2016

Answer:

#4.2xx10^3#

Explanation:

These take a little bit of getting used to.

Multiply by 1 and you do not change the inherent value. 1 can be written in many ways. So you can change the way something looks without changing its inherent value.

Example: multiply 3 by 1 but in the form of #1=4/4#

#3xx4/4= (3xx4)/4=12/4#
'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The objective is to have just 1 non zero value to the left of the decimal point and everything else to its right.

Given:#" "42000#

Multiply by 1 but in the form of #1=10000/10000#

#42000xx1000/1000#

#42000/1000xx1000#

#4.2xx1000#

But #1000# is the same as #10^3#

So #4.2xx1000" "->" "4.2xx10^3#