86.3k views
5 votes
what is the incorrect math sentence THE LCM IS 3, 6, 9 IS 18?? THE LCM OF 12 AND 15 IS 60 ?? THE LCM OF 4 AND 8 IS 16 ??

1 Answer

5 votes

The first step in determining lowest common factor, (LCM) is to express the numbers as factors.

For the first option,

3 = 3 * 1

6 = 3 * 2 * 1

9 = 3 * 3 * 1

The highest power of 3 is 2. the highest power of 2 is 1. thus, the LCM is

3^2 * 2^1 = 9 * 2 = 18

For the second option,

12 = 2 * 2 * 3

15 = 3 * 5

The highest power of 2 is 2. The highest power of 3 is 1. The highest power of 5 is 1. thus

LCM = 2^2 * 3^1 * 5^1 = 4 * 3 * 5 = 60

For the last option,

4 = 2 * 2

8 = 2 * 2 * 2

The highest power of 2 is 3. Thus,

LCM = 2^3 = 8

Thus, the incorrect math sentence is the third sentence

User AriG
by
8.6k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories