Questions: Which expression cannot be used to find 3 × 7?

Which expression cannot be used to find 3 × 7?
Transcript text: Which expression cannot be used to find $3 \times 7$ ?
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Solution

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Solution Steps

To determine which expression cannot be used to find \(3 \times 7\), we need to evaluate different expressions and see if they yield the same result as \(3 \times 7\). We will compare the results of these expressions to \(21\), which is the product of \(3\) and \(7\).

Step 1: Define the Target Product

To determine which expression cannot be used to find \(3 \times 7\), we first calculate the target product: \[ 3 \times 7 = 21 \]

Step 2: Evaluate the Expressions

We evaluate the given expressions to see if they match the target product:

  1. \(3 \times 7 = 21\)
  2. \(7 + 7 + 7 = 21\)
  3. \(21 = 21\)
  4. \(3 + 7 = 10\)
Step 3: Identify the Incorrect Expression

We compare each expression to the target product \(21\):

  • \(3 \times 7 = 21\) (correct)
  • \(7 + 7 + 7 = 21\) (correct)
  • \(21 = 21\) (correct)
  • \(3 + 7 = 10\) (incorrect)

Final Answer

\(\boxed{3 + 7 = 10}\)

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