09.23.2011
Multiplying Fractions Added to Conceptua Fractions
We are excited to announce that Conceptua® Fractions has been upgraded to include new lessons and a new interactive tool for teaching Multiplying Fractions. These lessons appear as Big Idea 8 - Multiplying Fractions. In conjunction with this upgrade, we are also publishing a new free tool for Multiplying Fractions.
The lessons in Big Idea 8 include some dramatic improvements to our visual approach to mathematics instruction. First, users will notice that nearly every problem begins as a word problem. We believe it is critical for students to develop their understanding of multiplying fractions in context. For example, “John’s yard is 4/5 of an acre. He mowed 2/3 of it. How many acres did he mow?”
Next, we use our new Context and Paraphrase system to bridge the student from the word problem to modeling. Students are asked to restate each word problem using a “paraphrase.” The paraphrase asks students to restate the story problem to a “groups of” or “parts of” statement. This simple statement gives the student a scaffold for understanding the problem conceptually to set up the visual models.
To support modeling multiplication, we have introduced two fantastic interactive models: the number line model and the area model. The number line model is introduced first as students have more experience with it. These are carefully employed for each problem type. As with all Conceptua Fractions units, Multiplying Fractions employs a careful sequence of practice problems. Students first learn the Context and Paraphrase system and the use of visual models by working with whole numbers. They experience increasingly complex problems until they eventually multiply a fraction by a fraction. Each lesson builds cognition and confidence for the student. Throughout this progression, the elements of the equation are gradually introduced until students are able to create the paraphrase, build the models, and complete the equation by themselves. In later lessons, models become optional, and it culminates in numbers-only problems.
We continue to support the problem types and the use of the models with interstitial screens, but you will notice that some of these screens now include video to better illustrate the interactivity of the different aspects of the paraphrase, models and equation.
Here’s a quick summary of the topics found in Big Idea 8:
Topic 1: Multiply a Whole Number by a Fraction
Multiply Whole Number by Whole Number 811
Multiply Whole Number by Unit Fraction 812
Multiply Whole Number by Unit Fraction - Simplify 813
Multiply Whole Number by Proper Fraction 814
Multiply Whole Number by Mixed Number 815
Topic 2: Multiply a Fraction by a Whole Number
Multiply Unit Fraction by Whole Number - Models 821
Multiply Unit Fraction by Whole Numbers 822
Multiply Proper Fraction by Whole Number 823
Multiply Mixed Types – Common Factors 824
Topic 3: Multiplying with Common and Uncommon Factors
Multiply Mixed Types: No Common Factors 831
Multiply Proper Fraction by Proper Fraction 832
Multiply Mixed Numbers and Whole Numbers 833
Multiply Mixed Number by Mixed Number 834
We have also added enhancements in other areas of the product in response to customer feedback. These include:
Improvements to the equivalence expression.
1) In lessons where the students are making equivalent fractions, the “equivalence expression” is positioned differently on the page. This is to help see that the starting value and the model are closely linked. 2) All of the models now include the “gray box” that identifies the equivalence expression. We had originally introduced this in the horizontal bar and because of its success, expanded it to the other models.
Class report indicates if a student did not pass.
If a student does not pass a lesson, but the teacher moves the student forward anyway, the teacher now gets a visual indication of which lessons this occurred on. On the teachers class progress report screen, a black dot will appear on any lesson that the student did not pass. Students will not see this on their progress screen.
Enhanced the look of the subtrahend model.
The subtraction model has a slight visual enhancement so that the shaded subtrahend appears more “negative. ” This change also creates a clearer representation the difference in a subtraction problem when you drag the subtrahend model over the minuend model.
Improved highlighting in text-to-speech.
Two color highlighting improves the student's ability to track the text while the word problems are read aloud.