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Notes about the homework. Two (or more) numbers will ALWAYS have a LCM. It’s only the GCF where if there are no factors in common that you say the GCF is 1.
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Notes about the homework • Two (or more) numbers will ALWAYS have a LCM. It’s only the GCF where if there are no factors in common that you say the GCF is 1. • The second way to find a LCM (multiply the numbers together and divide by their GCF) doesn’t always work when there are three or more numbers. Use the listing out multiples method instead. • Example: The GCF of 4, 6, and 8 is 2. 4×6×8 = 192 and 192÷2 = 96. However, the LCM of 4, 6, and 8 is 24. • 4: 4, 8, 12, 16, 20, 246: 6, 12, 18, 248: 8, 16, 24
Key words that tell us to subtract • Notice how for the last three, you have to switch the order when you turn it into math.