Question

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

Answer 1

`$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`.

Answer 2

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`