subtraction-step-2-different-denominators-video-14

# Interactive video lesson plan for: Subtraction Step 2 - Different Denominators (Video #14)

#### Activity overview:

Subtraction is illustrated with Fraction Bars for two different concepts. First, bars are compared to see the difference of their fractions, and this is called the Comparison Concept of Subtraction. Second, the Take-Away Concept is illustrated by taking-away or crossing out some of the parts of a bar. Illustrations for pairs of bars having parts of the same size leads to the rule for subtracting fractions whose denominators are equal, and for bars with different size parts to the need for obtaining common denominators. Finally, the complement of a fraction is illustrated with bars and used in examples of subtraction. The video ends with a demonstration of the free interactive web game "Fraction Rope Tug" from fractionbars.com.

Tagged under: Subtraction,bars,Comparison Concept,Take-Away Concept, denominators, denominators,-,complement,subtracting fractions,algorithm,fraction game,meaningful,intuitive,sense-making,home ed.,teaching,learning,instructional video,Fraction Bars,Albert B. Bennett,Jr.

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