Identify When Two Expressions Are Equivalent

For each pair of expressions: first test with substitution, then verify or disprove algebraically.

Grade 6·19 problems·~25 min·Common Core Math - Grade 6·standard·6-ee-a-4

Work through problems with immediate feedback

Fluency Practice

Test whether $5n + 3$ and $5(n + 3)$ are equivalent by substituting $n = 1$ .

Both equal 8 at $n = 1$ , so they might be equivalent.

Both equal 20 at $n = 1$ , so they are equivalent.

$5(1) + 3 = 8$ and $5(1 + 3) = 20$ . They differ, so the expressions are NOT equivalent.

They are equivalent because both contain 5 and 3.