5.NF.A.1 - Add and subtract fractions with unlike denominators (including mixed numbers) by replacing given fractions with equivalent fractions in such a way as to produce an equivalent sum or difference of fractions with like denominators. For example, 2/3 + 5/4 = 8/12 + 15/12 = 23/12. (In general, a/b + c/d = (ad + bc)/bd.)
5.NF.A.2 - Solve word problems involving addition and subtraction of fractions referring to the same whole, including cases of unlike denominators, e.g., by using visual fraction models or equations to represent the problem. Use benchmark fractions and number sense of fractions to estimate mentally and assess the reasonableness of answers. For example, recognize an incorrect result 2/5 + 1/2 = 3/7, by observing that 3/7 < 1/2.
GoMath Chapters 9 and 10
Lesson 9.1 Represent Addition with Unlike Denominators
Lesson 9.2 Represent Subtraction with Unlike Denominators
Lesson 9.3 Estimate Fraction Sums and Differences
Lesson 9.4 Rewrite Fractions with Sums and Differences
Lesson 9.5 Add and Subtract Fractions with Unlike Denominators
Lesson 10.1 - Adding fractions with unlike denominators
Lesson 10.2 - Rename Mixed Numbers to Subtract
Adding fractions with unlike denominators
3 easy ways for finding a common denominator for 2 fractions.
Shows how to simplify fractions using 3 different methods. Very straight forward explanations and examples.
Strategy for finding the LCM and GCF for 2 numbers.
Using money to solve adding fraction problems. Relates to how we were learning in class. This relates to one of the strategies that we are using in class. This isn't necessarily the way I taught it, but the concept is the same. To think about fractions in terms of money (1/4 of a dollar, or 1/4 of clock), to help think of equivalent fractions, can help students before they are ready to use the more traditional method of finding common denominators. Just use what they already know.
Using fractions related to time to find equivalent fractions for adding and subtracting fractions. Same as above but with time.