How do you simplify #2.1 div 4.41#?

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Answer 1 · 2016-08-08T11:12:34

#=10/21#

#2.1-:4.41#
#=210/441#
#=210/((21)(21))#
#=10/21#

Answer 2 · 2016-08-08T12:38:27

#2.1/2.1^2 = 2.1/(2.1xx2.1) = 1/2.1#

It is very useful to know some of the squares and other powers by heart.

#21 xx21 = 441#

In this case we could notice that the same numbers are used, just with decimals.

There are 2 decimal places in 4.41 and only one in 2.1

This leads us to realise that #2.1 xx2.1 = 4.41#

And consequently: #2.1/2.1^2 = 2.1/(2.1xx2.1) = 1/2.1#