Illustrative Mathematics is an initiative of the Institute for Mathematics & Education at the University of Arizona. The website launch team is headed by Bill McCallum, lead author of the CCSS in math, who also writes the blog Tools for the Common Core Standards.
Why very cool? There are more than 400 illustrative tasks for the Common Core on the site, all FREE!
Since I know very well how busy teachers are, I want to show you that this site is worth exploring. Below, I have copied and pasted just one of the tasks for Grade 5, so that you can see the task itself, read the provided commentary, and explore the two proposed solutions:
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5.NF Painting a Wall
Alignment 1: 5.NF.B
Grade 5
Domain NF: Number and Operations---Fractions
Cluster Apply and extend previous understandings of multiplication and division to
multiply and divide fractions.
Nicolas is helping to paint a wall at a park near his house as part of a community service project. He had painted half of the wall yellow when the park director walked by and said,
"This wall is supposed to be painted red."
Nicolas immediately started painting over the yellow portion of the wall. By the end of the day, he had repainted 5/6 of the yellow portion red.
What fraction of the entire wall is painted red at the end of the day?
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Commentary: The purpose of this task is for students to find the answer to a question in context that can be represented by fraction multiplication. This task is appropriate for either instruction or assessment depending on how it is used and where students are in their understanding of fraction multiplication. If used in instruction, it can provide a lead-in to the meaning of fraction multiplication. If used for assessment, it can help teachers see whether students readily see that this is can be solved by multiplying 5/6×1/2 or not, which can help diagnose their comfort level with the meaning of fraction multiplication.
The teacher might need to emphasize that the task is asking for what portion of the total wall is red, it is not asking what portion of the yellow has been repainted.
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Solution: Solution 1
In order to see what fraction of the wall is red we need to find out what 5/6 of 1/2 is. To do this we can multiply the fractions together like so:
5/6×1/2=(5×1)/(6×2)=5/12
So we can see that 5/12 of the wall is red.
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