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Isabel tried to evaluate an expression step by step.

{:[(2+8)+8],[=2+(8+8)quad" Step "1],[=2+0quad" Step "2],[=2quad" Step "3]:}
Find Isabel's first mistake.
Choose 1 answer:
A Changing the groups changes the sum's value.
(B) 8 plus 8 equals 16 , not 0 .
(c) 2 plus 0 equals 0 , not 2 .

Isabel tried to evaluate an expression step by step. $\newline$ $\begin{array}{l} (2+8)+8 \\ =2+(8+8) \quad \text { Step } 1 \\ =2+0 \quad \text { Step 2 } \\ =2 \quad \text { Step } 3 \\ \end{array}$ $\newline$ Find Isabel's first mistake. $\newline$ Choose $1$ answer: $\newline$ (A) Changing the groups changes the sum's value. $\newline$ (B) $8$ plus $8$ equals $16$ , not $0$ . $\newline$ (C) $2$ plus $0$ equals $0$ , not $2$ .

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Solve a system of equations using substitution: word problems

Full solution

Q. Isabel tried to evaluate an expression step by step.

\newline

\begin{array}{l} (2+8)+8 \\ =2+(8+8) \quad \text { Step } 1 \\ =2+0 \quad \text { Step 2 } \\ =2 \quad \text { Step } 3 \\ \end{array}

\newline

Find Isabel's first mistake.

\newline

Choose

1

answer:

\newline

(A) Changing the groups changes the sum's value.

\newline

(B)

8

plus

8

equals

16

, not

0

.

\newline

(C)

2

plus

0

equals

0

, not

2

.

Start with expression: Isabel starts with the expression $[(2+8)+8]$ . She then rewrites it as $[2+(8+8)]$ in Step $1$ . This is an application of the associative property of addition, which states that the way in which numbers are grouped does not change their sum. Calculation: $(2+8)+8 = 2+(8+8)$ Math error check:
Apply associative property: In Step $2$ , Isabel evaluates the expression $[2+(8+8)]$ as $[2+0]$ . Here, she should have added $8$ and $8$ to get $16$ , not $0$ . Calculation: $8+8 = 16$ , not $0$ . Math error check:

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\newline

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\newline

1

\newline

1

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2

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\newline

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