To have a HCF, you need at least 2 numbers. There is no HCF in just 1 number.
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680
15% off of 680 = 85% of 680 = 680*85/100 = 578
It is then 680 because 5 rounds up to 10
The greatest common factor (GCF) is often also called the greatest common divisor (GCD) or highest common factor (HCF). Keep in mind that these different terms all refer to the same thing: the largest integer which evenly divides two or more numbers.The greatest common factor of 510, 680, and 850 is 170
340 + 340 = 680 680 + 680 = 1,360