An orange costs $.09. How much would 2 dozen oranges cost?

2 Answers
Aug 20, 2016

#$2.16#

Explanation:

To begin with, #2# dozen oranges would be the same as #24# oranges since there are #12# of something in a dozen (just simply multiply #12# by #2# in this case).

In addition, if each orange costs #$0.09#, you could multiply #$0.09# by #24# to find the total cost, which would give you a result of #$2.16#.

Aug 23, 2016

Another way of thinking about it that may help you do things like this in your head. If you wished to do so.

#$2.16#

Explanation:

#color(brown)("There is no reason why you should not write down a few numbers")# #color(brown)("but still do a lot of the working out in your head.")#

Doing it is much quicker than explaining it
'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The calculation we need to do is #24xx$0.09#
Let's explore another way of doing it.....

1 dozen is 12, so 2 dozen is #2xx12#

But #12 = 10+2#

Multiplying a number by 10 or 2 is much easier than multiplying by 12.
'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#10xx$0.09 = $0.90#
#color(white)(1)2xx$0.09=ul($0.18)" "larr" add"#
#" "$1.08#
'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
So #12xx$0.09=$1.08#

So #24xx$0.09=2xx$1.08= $2.16#