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▷ ▶ Adding or subtracting unlike denominators SelectSmart.com free Education flowcharts and decision trees.
 A SelectSmart.com Flowchart by MKillian. See MKillian's 4me blog page. Viewed 141 times. Created October 2019. Information and items from Amazon.com you may find helpful. This SelectSmart.com Education flowchart, a free online decision tool is a creation of MKillian and for amusement purposes only. The implicit and explicit opinions expressed here are the author's. SelectSmart.com does not necessarily agree. Cookies Consent Information
Adding or subtracting unlike denominators
By MKillian
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 How to add and subtract unlike denominator fractions. Numerator (top number), Denominator (bottom number) Do the fractions have the same denominator? NO Find the least common multiple (LCM). Remember that's a list of the multiples, use a X's chart if you want. Circle the LCM so you can create an equivalent fraction where the denominator is the same as the LCM. Do this for both fractions. See next step. YES Add or subtract the numerators and keep the denominators the same. YOU ARE DONE! Figure out what number can be multiplied by the old denominator so it is equal to the new denominator (that you found using LCM). Multiply the numerator and denominator by the same number (whatever you do to the top, you have to do to the bottom). Rewrite your new equation and solve.