Adding Fractions using Doughnuts

STANDARDS CCSS.MATH.CONTENT.4.NF.B.3Understand a fraction a/b with a > 1 as a sum of fractions 1/b. CCSS.MATH.CONTENT.4.NF.B.3.CAdd and subtract mixed numbers with like denominators, e.g., by replacing each mixed number with an equivalent fraction, and/or by using properties of operations and the relationship between addition and subtraction. LESSON TIME 20-30 minutes SUMMARY This lesson for Grades 4-5 uses doughnuts to

Build a Model

Standard There’s more than one way to solve a problem, which is why we have a whole series of videos teaching problem-solving. Lesson One problem-solving strategy: build a model A model can be visual, as shown in this video. There’s also nothing wrong with a physical model, say, actually putting a dozen books in a