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Common Core Standards
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Timed Test For
Equivalent expressions with negative numbers
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Sample Problem
Isabel tried to evaluate an expression step by step. $\quad\begin{align} &(2+8)+8\\\\ \\ =&2+(8+8)&\green{\text{Step } 1} \\\\ \\ \\ =&2+0&\blue{\text{Step } 2}\\\\ \\ \\ =&2&\purple{\text{Step } 3} \\\\ \\ \\ \end{align}$ **Find Isabel's mistake.** [[☃ radio 1]]
Isabel tried to evaluate an expression step by step.
(
2
+
8
)
+
8
=
2
+
(
8
+
8
)
Step
1
=
2
+
0
Step
2
=
2
Step
3
\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.
Choose 1 answer:
Choose 1 answer:
A
Step
1
\green{\text{Step }1}
Step
1
B
Step
2
\blue{\text{Step }2}
Step
2
C
Step
3
\purple{\text{Step }3}
Step
3
D
Isabel did not make a mistake.
What's your name?
Duration
30 seconds
60 seconds (1 minute)
120 seconds (2 minutes)
180 seconds (3 minutes)
300 seconds (5 minutes)
