Question

Alyssa attempted to smplify the four numeric expressions shown here #1 11+3X3 14X3 42 #2 80 divided by 2+4 40 divided by 4 40 #3 4(3 divided by 7) 4(10) 40 #4 5X10-10 50-10 40 which simplification is not correct?

Answer 1

When we have expressions where multiplications, divisions, additions and substractions are made, we have an order to solve them: First, we have to solve multiplications and divisions and then we can solve additions and substractions.

The one that has a mistake is #1, because she has:

$11+3\cdot3$

She should have solved 3*3 first, and then add 11 to the result:

$\begin{gathered} 11+3\cdot3 \\ 11+9 \\ 20 \end{gathered}$

The error is in that she add the 11 to a 3, and then multiplicate the result, what is incorrect.

The other expressions are solved in the right order.

Answer: #1