Write the following number in standard decimal form? (four tenths)

1 Answer
Jim G.
Jan 28, 2018

#4xx10^-1#

Explanation:

#4/10=0.4" as a decimal fraction"#

#"to express in standard form "#

#•color(white)(x)axx10^n#

#"where "1<=a<10" and n is an integer"#

#0.4=4color(red)(•)0" as a number between 1 and 10"#

#"we now require to move the decimal point back to "#
#"where it should be 1 place to the left"#

#• " a move to the left is denoted by n being negative"#

#• " a move to the right is denoted by n being positive"#

#rArr4/10=0.4=4xx10^(-1)larrcolor(blue)"in standard form"#

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