Homework Help Forum: Math

Posted by Renriki on Monday, November 2, 2009 at 5:12pm.

What if the denominator were 9 and 7. How would you do it? Ex: 5/9 + 6/7 =

• Math - Ms. Sue, Monday, November 2, 2009 at 5:19pm

  You find the smallest number that both 9 and 7 goes into evenly. Multiples of 9 = 9, 18, 27, 36, 45, 54, 63 . . . Since 63 is the smallest number divisible by both 7 and 9, it's the common denominator. 63/9 = 7 Multiply both numerator and denominator by 7 5/9 = 35/63 63/7 = 9 6/7 = 54/63 35/63 + 54/63 = 89/63 = 1 26/63 6/7 =

  
  

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