Subtraction of two fractions is modeled by comparing the shaded amounts of their Fraction Bars. This can be done in two ways: (1) Determining the difference in the shaded amounts; or (2) adding up from the smaller shaded amount to the larger (the Add-up Method). Differences are also illustrated by using the Capture mat. This mat has twelfths bars which provide a common denominator for the twelfths family of fractions. Subtraction of fractions is also illustrated on the number line. By placing one bar above the line and one bar below, the difference in shaded amounts can be read from the number line. The Number Lines mat from the Fraction Bars materials has six number lines on one side and six number lines on the other for fractions with various denominators. The video ends with a demonstration of the free interactive web game "Number Lines Racing" from fractionbars.com.
Visit FractionBars.com for more information.
Tagged under: Subtraction,fractions,model,comparing,difference,add- method,common denominator,twelfths family,number line,fraction game,meaningful,intuitive,sense-making,home ed.,teaching,learning,instructional video,Fraction Bars,Albert B. Bennett,Jr.
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