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

Question

Autumn Arnold · Accepted Answer

#$2.16# 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#.

Genesis Amaya · Answer

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# #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#