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What is 3 over 7 plus 9 over 21?

Wiki User

∙ 2012-02-09 20:05:59

Best Answer

3/7+ 9/21 is equal to (3x3)/(7x3) + 9/21 which is equal to 9/21 + 9/21 , because both denominators are the same you can simply add the two numerators which then becomes 18/21 , then yo can cancel it down to 6/7

Wiki User

∙ 2012-02-09 20:05:59

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What is the LCD for 1 over 7 and 3 over 21?

3/21 is equal to 1/7, so your question does not make sense.

What is the sum of 1 over 7 pluse 3 over 21?

2/7

What is 1 over 12 plus 7 over 12?

1/12 plus 7/12 is 2/3

What is the factor of x2-10x plus 21?

(x - 3)(x - 7)

Factor x.2 plus 10.x plus 21?

(x + 7)(x + 3)

Related questions

What is 1 over 3 plus 2 over 7?

1/3 + 2/7 = 7/21 + 6/21 = 13/21

What is 1 over 3 plus 5 over 7?

3 over 21

What is 2 over 7 plus 2 over 3?

2/7 +2/3 = 6/21 + 14/21 = 20/21

What is 4 over 7 plus 1 over 3?

4/7 + 1/3 = get common denominator 12/21 + 7/21 = 19/21 is your answer add

What is 2 over 3 plus 3 over 7 in simplest form?

14/21 + 9/21 = 23/21

What is 6 over 7 plus 1 over 3?

6/7 + 1/3 = 14/21

What is 2 over 7 plus 1 over 3?

It is: 13/21

What is 1 over 7 plus 2 over 3?

17 over 21

What does 1 over 7 plus 2 over 3 equal?

1/7 + 2/3 is 17/21

What is 1 over 7 plus 3 over 21?

Expressed as a proper fraction in its simplest form, 1/7 + 3/21 = 2/7 or two sevenths.

9 over 21 in simplest form?

3 over 7 because nothing can get to 2 when your dividing by 9 plus 9/3=3 and 21/3=7 ( / = division)

What is 6 over 7 plus 1 over 3 in simplest form?

6/7+1/3 = 25/21

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