How do you write #2.5xx10^7# in expanded form?

1 Answer
Sep 27, 2016

#2.5xx10^7=25000000.0#

Explanation:

In scientific notation, we write a number so that it has single digit to the left of decimal sign and is multiplied by an integer power of #10#.

In other words, in scientific notation, a number is written as #axx10^n#, where #1<=a<10# and #n# is an integer and #1<=a<10#.

To write the number in normal or standard notation one just needs to multiply by the power #10^n# (or divide if #n# is negative). This means moving decimal #n# digits to right if multiplying by #10^n# and moving decimal #n# digits to left if dividing by #10^n# (i.e. multiplying by #10^(-n)#).

In the given case, as we have the number as #2.5xx10^7#, we need to move decimal digit to the right by seven points. For this, let us write #2.5# as #2.50000000# and moving decimal point three points to right means #25000000.0#

Hence in standard notation #2.5xx10^7=25000000.0#