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Tom [10]
3 years ago
15

Find the least common multiple of 3 and 7

Mathematics
2 answers:
Sav [38]3 years ago
8 0

The LCM of two prime numbers is generally just their product, since they share no common factors.


3 and 7 are both prime numbers, so their LCM (least common multiple) is simply the numbers multiplied together. In this case, the LCM is thus 21.

Arada [10]3 years ago
3 0

Answer: 21

Step-by-step explanation: To find the least common multiple or <em>lcm</em> of 3 and 7, begin by finding the first few multiples of each number and comparing the lists.

<u><em>Multiples of 3</em></u>

1 × 3 = 3

2 × 3 = 6

3 × 3 = 9

4 × 3 = 12

5 × 3 = 15

6 × 3 = 18

7 × 3 = 21

<em><u>Multiples of 7</u></em>

1 × 7 = 7

2 × 7 = 14

3 × 7 = 21

Since 21 appears in both lists, we can stop here.

Therefore, the least common multiple of 3 and 7 is 21.

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Answer:

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Step-by-step explanation:

1. Approach

To solve this problem, one first has to think about the given figure in a certain way. In the figure, one can see that it is a circle attached on either side of a rectangle. To find the perimeter of the figure, one has to find the circumference of the circle and then add two sides of the rectangle to the answer

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Normally to find the circumference of a semicircle, one would have to divide this formula by 2, but since in this case, one has to add two congruent semicircles, so therefore, the effect of dividing the equation by two, only to multiply by two again cancels, and hence, there is no need to divide by 2.

Substitute in the values;

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