To rewrite the expression \( (63 + 81) \) using the Greatest Common Factor (GCF), we first need to find the GCF of the numbers 63 and 81.
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List the factors:
- The factors of 63 are \( 1, 3, 7, 9, 21, 63 \).
- The factors of 81 are \( 1, 3, 9, 27, 81 \).
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Find the GCF:
- The common factors are \( 1, 3, 9 \).
- The greatest common factor is \( 9 \).
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Factor out the GCF:
- We can express \( 63 \) and \( 81 \) in terms of \( 9 \):
- \( 63 = 9 \times 7 \)
- \( 81 = 9 \times 9 \)
- We can express \( 63 \) and \( 81 \) in terms of \( 9 \):
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Rewrite the expression:
- Now we can factor \( 9 \) out of \( 63 + 81 \): \[ 63 + 81 = 9 \times 7 + 9 \times 9 = 9 (7 + 9) \]
Thus, the expression \( (63 + 81) \) can be rewritten as: \[ (63 + 81) = 9(7 + 9) \]
In the format you provided, it would be: \[ (63 + 81) = 9(7 + 9) \] So the blanks would be filled with: 9, 7, 9.
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