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Example: 1/30 and 1/42
Their LCD is 210.
Multiply each one by whatever it takes to make 210 in the denominator.
30 x 7 = 210
42 x 5 = 210
1/30 x 7/7 = 7/210
1/42 x 5/5 = 5/210

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Wiki User

12y ago

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More answers

Example: 1/30 and 1/42
Factor them.
2 x 3 x 5 = 30
2 x 3 x 7 = 42
Combine the factors, eliminating duplicates.
2 x 3 x 5 x 7 = 210, the LCD

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Wiki User

12y ago
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What do you mean "take out"? To find the LCD for several fractions look only at the denominators and find the lowest number or algebraic expression that evenly divides into all of them.

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Wiki User

11y ago
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Example: 1/30 and 1/42
Factor them.
2 x 3 x 5 = 30
2 x 3 x 7 = 42
Combine the factors, eliminating duplicates.
2 x 3 x 5 x 7 = 210, the LCD

User Avatar

Wiki User

12y ago
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Example: 1/30 and 1/42

Factor the denominators.

2 x 3 x 5 = 30

2 x 3 x 7 = 42

Combine the factors, eliminating duplicates.

2 x 3 x 5 x 7 = 210, the LCD

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Wiki User

12y ago
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You dont

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Wiki User

12y ago
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Q: How do you get the LCD of a dissimilar fractions?
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