## Friday, June 29, 2012

### Friday Freebie! - Exploring Quadrilaterals

After two weeks without my computer, I finally have it back! Here's an activity I adapted for my class to compare and analyze attributes of quadrilaterals. This file includes 12 quadrilateral sorting cards, a chart for analyzing attributes, a page to draw in lines of symmetry, and an answer key.
This activity meets the following Common Core Standards for Mathematics:
• 4.G.2 Classify two-dimensional figures based on the presence or absence of parallel or perpendicular lines, or the presence or absence of angles of a specified size.
• 4.G.3 Recognize a line of symmetry for a two-dimensional figure as a line across the figure such that the figure can be folded along the line into matching parts. Identify line-symmetric figures and draw lines of symmetry.
• 5.G.3 Understand that attributes belonging to a category of two-dimensional figures also belong to all subcategories of that category. For example, all rectangles have four right angles and squares are rectangles, so all squares have four right angles.
• 5.G.4 Classify two-dimensional figures in a hierarchy based on properties.

## Thursday, June 14, 2012

### Introduction to Multiplication

My summer class is already half over and we've just begun to think about teaching multiplication and division. Here's the introductory activity I gave them to think about repeated addition, making arrays, and writing number sentences.

This activity meets the following Common Core Standards for Mathematics.
• 2.OA.4 - Work with equal groups of objects to gain foundations for multiplication. Use addition to find the total number of objects arranged in rectangular arrays with up to 5 rows and up to 5 columns; write an equation to express the total as a sum of equal addends.
• 3.OA.1 - Represent and solve problems involving multiplication and division. Interpret products of whole numbers, e.g., interpret 5 × 7 as the total number of objects in 5 groups of 7 objects each. For example, describe a context in which a total number of objects can be expressed as 5 × 7.

## Monday, June 11, 2012

### Monday Math Freebies - Numbers to 10

This week's freebie is a set of puzzle cards for the numbers 1-10. For each puzzle set you'll find the numeral, number word, an addition sentence and a subtraction sentence. The addition and subtraction sentences use addends of 0, 1 and 2. The puzzles are color coded with green for numbers 1-5 and blue for numbers 5-10.

## Wednesday, June 6, 2012

### The Teaching of Climate Change - Teacher Perspectives

In the second part of a two-part series (part I was on the teaching of evolution), AAAS talks with middle and high school teachers across the country to find out what it’s like to teach the often-controversial science topic of climate change and how they deal with the pushback.

Here's the link to Classroom Clashes: Teaching Climate Change.

If you are looking for information on climate change, visit the UCAR Science Education site on Climate.

## Monday, June 4, 2012

### Monday Math Freebies - Numbers to 20

This week's freebie is a set of "I have, who has?" cards for the numbers 1-20. You'll find number words, ten frames, dice, playing cards, dominoes, base ten blocks, and tally marks. The goal with this set is for students to recognize the numbers from 1-20 in a variety of forms.