The GCF is 11.
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The GCF is 77.
First find the prime factors of each: 847= 7 x 11 x 11 91= 7 x 13
121
To round 847 to the nearest 10, we look at the digit in the tens place, which is 4. Since 4 is less than 5, we round down. Therefore, 847 rounded to the nearest 10 is 840.
800