When you find the LCM you are looking for the least common multiple in numbers.
It doesn't matter how many number you have you list the multiples of each number and the number that is the same that comes first is your LCM. For example if you want to find the LCM 21 and 7 the LCM would be 21 because if you list the multiples (count by 20 and 7) 21 is common in both numbers.
When you are looking for the GCF (greatest common factor) you list the factors that go into the number in a list of numbers. The largest number that goes into the set of numbers is your GCF. If there is no number but one, your GCF is 1 for example 3 and 7. one and three both go into 3 and 1 and 7 go into 7 to the common number in both of them are 1. if you have the numbers let say 4 and 8, the number that go into 4 are 1, 2, and 4. The numbers that go into 8 are 1, 2, 4, and 8. As you can see the numbers 1, 2, and 4 are the common but the largest number that is common is 4.
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The answer is: reduction
Explanation: since there are prime number markings on the smaller shape, that is the second version. In other words, the bigger shape was the original because there are no prime markings (‘) on it and to turn into the smaller shape, it had to shrink (reduce)
Density per square block means the area:
Area = Length x width = 2 x 2 = 4 square blocks.
Now for density divide the population by the area:
1.5 million people / 4 square blocks = 0.375 million people per square block
0.375 million = 375,000