Question

Isabel tried to evaluate an expression step by step.
\quad\begin{aligned} &(2+8)+8\\\\ \\ =&2+(8+8)&\green{\text{Step } 1} \\\\ \\ \\ =&2+0&\blue{\text{Step } 2}\\\\ \\ \\ =&2&\purple{\text{Step } 3} \\\\ \\ \\ \end{aligned}
=
=
=
​

(2+8)+8
2+(8+8)
2+0
2
​

Step 1
Step 2
Step 3
​

Find Isabel's mistake.

Answer 1

Answer:

• Step 3

Step-by-step explanation:

1. (2+8)+8
2. 2+(8+8)    
3. 2+0         mistake, 8 + 8 ≠ 0, should be 16 instead of zero
4. 2

Answer 2

Answer:

Step three

Step-by-step explanation:

(2+8)+8

2+(8+8)    

2+0

2

In the third step Isabel subtracted 8 into 8 not added, in order to evaluate the expression correctly she needed to add 8 into 8 and then add the two.

$(2+8)+8$

$2+(8+8)$

$8+8=16$

$2+16=18$

$=18$

Hope this helps.