Question

Which of the following expression(s) evaluates to a value of 9?
$1.5+40÷5-4$
$2.40-30÷10+8$
$3.18÷(8\times 0+18)$
$4.5\times (10-4)-21$

• A. 3 and 4
• B. 1 and 2
• C. 2 and 3
• D. 1 and 4

Answer 1

The correct option is D 1 and 4

Evaluate the expressions by following the order of operations.
1.
$5+\underset{–}{40÷5}-4=5+8-4$
$\underset{–}{5+8}-4=13-4$
$\underset{–}{13-4}=9$
2.
$40-\underset{–}{30÷10}+8=40-3+8$
$\underset{–}{40-3}+8=37+8$
$\underset{–}{37+8}=45$
45 is not equal to 9.
3.
$18÷(8\times 0+18)$
First, we simplify parentheses.
$(\underset{–}{8\times 0}+18)=\left(\underset{–}{0+18}\right)=18$
So, $18÷(8\times 0+18)=18÷18=1$
1 is not equal to 9.
4.
$5\times \left(\underset{–}{10-4}\right)-21=5\times 6-21$
$\underset{–}{5\times 6}-21=30-21$
$\underset{–}{30-21}=9$