#1**+18 **

I typed GCF(34,784) into my calculator, and got \(\boxed 2\) as my GCF.

I did the same for the LCM and got \(\boxed{13328}\).

http://www.mathematicsmagazine.com/applications/GCF_LCM.htm

You can use this to find both of them if you do not have a calculator that can calculate GCF and LCM.

KnockOut Oct 25, 2018

#2**+18 **

**The Greatest Common Factor**

The greatest common factor, or GCF, is the greatest factor that divides two numbers. To find the GCF of two numbers:

List the prime factors of each number.

Multiply those factors both numbers have in common. If there are no common prime factors, the GCF is 1.

**The Least Common Multiple**

A common multiple is a number that is a multiple of two or more numbers. The common multiples of 3 and 4 are 0, 12, 24, ....

The least common multiple (LCM) of two numbers is the smallest number (not zero) that is a multiple of both.

KnockOut Oct 25, 2018

#3**+9 **

**What is the GCF and LCM of 34 and 784? **

\(\begin{array}{|rcll|} \hline 34 &=& 2^1\cdot 17^1 \cdot (7^0) \\ 784 &=& 2^4\cdot 7^2 \cdot (17^0) \\\\ && \begin{array}{|rcll|} \hline \text{gcf}(34,784) &=& 2^1\cdot 17^0 \cdot 7^0 \quad & | \quad \text{min exponent} \\ &=& 2\cdot 1 \cdot 1 \\ &=& \mathbf{2} \\\\ \text{lcm}(34,784) &=& 2^4\cdot 17^1 \cdot 7^2 \quad & | \quad \text{max exponent} \\ &=& 16\cdot 17 \cdot 49 \\ &=& \mathbf{13328} \\ \hline \end{array}\\ \hline \end{array}\)

heureka Oct 25, 2018