math
2006-06-18 05:14:38 · 9 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
It's the smallest number that the denominator of multiple fractions can be increased to so that they're all the same.
Examples:
1/3 & 1/4 - LCD is 12 (4/12 & 3/12)
1/2 & 1/6 & 1/5 - LCD is 30 (15/30 & 5/30 & 6/30)
2006-06-18 05:21:48 · answer #1 · answered by Flyboy 6 · 1⤊ 0⤋
The least common denominator (LCD) is used to add two fractions which have different denominators. Say you want to add 1/4 and 1/6. First you need to change these fractions so that they have a common denominator. The LCD is 12 since 12 is divisable by both 4 and 6.
Next change your fractions 1/4 = x/12 = 3/12
and 1/6 = 6/12
So 1/4 + 1/6 = 3/12 + 6/12 = 9/12
24 or 48 would have worked also but 12 is used because it is the LEAST common denominator whereas 24 is just A common denominator.
How does one find the LCD? First you factor each denominator: 4 = 2*2, and 6 = 2*3. The common factors between these two numbers is 2. So take out the 2. The remaining factors are another 2 and a 3. Multiply all of these together 2*2*3=12 gives you your LCD.
2006-06-18 05:39:38 · answer #2 · answered by Cas 4 · 0⤊ 0⤋
In mathematics, the lowest common denominator or least common denominator (abbreviated LCD) is the least common multiple of the denominators of a set of vulgar fractions. For instance, the LCD of {1/2, 1/4} is 4, while the LCD of {1/2, 1/3} is 6.
2006-06-18 23:36:58 · answer #3 · answered by Anonymous · 0⤊ 0⤋
actual, same as liquid crystal reveal if those were denominators of fractions. Multiples of fifty six are fifty six, 112, 168, ...(fifty six*a million. fifty six*2, fifty six*3,...) Multiples of 21 are 21, 40 2, sixty 3,...(21*a million, 21*2, 21*3,...) "basic" potential the multiples that they have got in basic "Least" potential the smallest one they have in basic you need to write the lists until eventually you spot the least in both lists, yet that typically takes a lengthy time period. best factoring each and each enormous choice is the first step in a fashion that doesn't frequently take too lengthy. The best factorization of fifty six is two*2*2*7 The best factorization of 21 is 3*7 The LCM has to have each best element the finest variety of cases curiously in both factorization. So, we make sure 3 2's, one 3, and one 7. The LCM then is two*2*2*3*7=168
2016-11-14 22:41:14 · answer #4 · answered by ? 4 · 0⤊ 0⤋
The least common denomiantor or Least common multiple is the smallest number having the numbers (denominators) as its factors.
2006-06-18 05:18:56 · answer #5 · answered by ag_iitkgp 7 · 0⤊ 0⤋
The question should be LCM or HCF. Not LCD
Lowest Common Multiple & Highest Common Factor.
2006-06-24 15:10:00 · answer #6 · answered by Anonymous · 0⤊ 0⤋
i'm not forsure but i will take a guess i think 2 because it's a even number.
2006-06-18 05:51:14 · answer #7 · answered by tasha.joey 1 · 0⤊ 1⤋
the people answering these questions...
2006-06-18 05:20:54 · answer #8 · answered by Kist 1 · 0⤊ 0⤋
what they said
2006-06-18 06:19:13 · answer #9 · answered by Anonymous · 0⤊ 0⤋