2. Math Vocabulary Common Denominator – “CD”: The same bottom #s of a fraction [needed to compare, *ADD & SUBTRACT] (find by finding LCM)  LCM = LCD LCD – Lowest Common Denominator: FIRST / LOWEST bottom #s in common

3. Finding Common Denominators “CD”s Reminder: LCM = LCD Steps: 1) Find the LCD (=LCM) of given bottom #s [denominators] 2) Make [new] equivalent/equal fractions… Find the Common Denominator (CD) 3 8 2 4 CD =

4. More practice w/ finding CDs Things to remember: *LCM = LCD 1) Find LCD 2) Make [new] equal fractions Write equivalent fractions for: 3 4 2 6 CD =

5. EXAMPLES Compare >, <, =: 2 2 3 4 CD = Compare >, <, =: 5 7 6 9 CD =

6. Practice… a) Find the Common Denominator (CD) ONLY of 3 and 4 5 6CD = b) Write equivalent fractions for 1 and 2 3 4 c) Compare >, <, = 2 7 4 10