How do you evaluate \[\left( {40 \div 4} \right) + 9\] ?

Hint: We have a simple mathematics problem. We can solve this using the BODMAS rule. That is the BODMAS expansion is Brackets, Order, Division, Multiplication, Addition and subtraction. We must apply the order of operation that is from brackets first to addition and subtraction last.

Complete step by step solution:
Given,
 \[\left( {40 \div 4} \right) + 9\] .
The BODMAS rule states that we should calculate the brackets first then order then any division or multiplication and finally any addition or subtraction.
First we simplify the brackets by applying addition operation and then subtraction,
 \[ \Rightarrow \left( {40 \div 4} \right) + 9\]
 \[ \Rightarrow \left( {\dfrac{{40}}{4}} \right) + 9\]
 \[ \Rightarrow 10 + 9\]
Now we only have addition operation, applying this we have,
 \[ \Rightarrow 19\] .
This is the required result.
So, the correct answer is “19”.

Note: We should know that the product of a negative number with a negative number results in a positive number. The product of a negative number and a positive number results in a negative number, similarly the product of positive number and the negative number results in a negative number. Also while shifting the number from one side of the equation to the other side of the equation the signs must change.