Q: Find the least common denominator for fractions with denominators 45 and 42?

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The least common denominator is 144.

If the denominators are not the same, then you have to use equivalent fractions which do have a common denominator . To do this, you need to find the least common multiple (LCM) of the two denominators. To add fractions with unlike denominators, rename the fractions with a common denominator.

If 33 and 6 are denominators of fractions then the least common denominator is 66

No. If the denominators are the same, you subtract the numerators. If the denominators are different you have to find the least common denominator.

The Least (or Lowest) Common Multiple (LCM) is the smallest number that is a multiple of both numbers. For example: the LCM of 10 and 4 is 20, because both 10 and 4 go into 20 and 20 is the smallest number both 10 and 4 can go into. To be able to add or subtract fractions they must have the same denominator. If the denominators are different then the fractions must first be converted into equivalent fractions with a common denominator; any common denominator can be used, but by using the Least Common Multiple of the denominators as the new denominator it keeps the numbers smaller; this smallest denominator is known as the Least Common Denominator Thus the Least Common Denominator is the Least Common Multiple of the denominators of two (or more) fractions (used when adding or subtracting fractions with different denominators). As the Least Common Multiple is used most often with adding or subtracting fractions, it is often referred to as the Least Common Denominator (because the numbers being considered are usually denominators of fractions).

Related questions

The least common denominator is the least common multiple of the denominators of the fractions.

The least common denominator for fractions with those denominators (11, 8 and 6) is 264.

The least common multiple of two or more denominators is known as the least common denominator, or LCD.

The Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of a pair of fractions. I assume the 7 and 21 are the denominators of two fractions you need to add or subtract.LCD(7, 21) = 21.

the least common denominator

The least common denominator is 144.

If the denominators are not the same, then you have to use equivalent fractions which do have a common denominator . To do this, you need to find the least common multiple (LCM) of the two denominators. To add fractions with unlike denominators, rename the fractions with a common denominator.

42

No. If the denominators are the same, you subtract the numerators. If the denominators are different you have to find the least common denominator.

If 33 and 6 are denominators of fractions then the least common denominator is 66

There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of a pair of fractions.

The least common denominator, or LCD