2 and 5 are coprime integers: they do not have any common factors. Therefore the GCF is 1 and the LCM is their product, 2x5=10.
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To find the LCM, you need to find the GCF. 120 factors to [2 2 2 3 5] 16 factors to [2 2 2 2] Common factors [2 2 2] GCF = 8 Now, the LCM is the product divided by the GCF 120 * 16 / 8 = 240 ■
2 x 3 = 6 2 x 5 = 10 The GCF is 2.
You don't find the GCF and LCM of a single number, you need at least two. Ladders, trees, fireworks, rainbows... It's all the same thing, just different ways of writing the factors on the page. Find a way that works for you. To find the GCF and LCM of 30 and 42, you need to factor them. 30 42 15,2 21,2 5,3,2 7,3,2 2 x 3 x 5 = 30 and 2 x 3 x 7 = 42 To find the GCF, select the common factors. 2 x 3 = 6, the GCF. To find the LCM, combine the factors, eliminating duplicates. 2 x 3 x 5 x 7 = 210, the LCM
The GCF is 5. The LCM is 315.
10: 2,5,10 5: 5 GCF of 5 and 10 = 5 LCM is 5