Monday, February 29, 2016

Leap Day!



   We began Leap Day by sitting in a circle and passing a ball around while spinning it, to model the rotation of the earth while it orbits the sun. I explained that the earth rotates 365 1/4 times during each orbit, which is why we add a du every four years. At math time, students found as many ways they could to make the number 29, and we did standing long jumps . . . 


. . . And measured them in inches and centimeters, data we will use in a future math lesson.  We also read a Leap Year poem.

Thursday, February 25, 2016

100th Day of School

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To celebrate the 100th day of school, students read a 100 poem aloud to one another.



    Using clues involving place value, they colored in squares on a number grid to reveal 100.

 They built structures using 100 pattern blocks.










  Together, they read more than 100 books.





Monday, February 22, 2016

Venn Diagram




 
As part of our study of Asia, I read aloud Lon Po Po, a Chinese version of Little Red Riding Hood. The students complete Venn Diagrams comparing the two tales. Pretty sophisticated stuff for second grade!

Thursday, February 11, 2016

Open Number Lines



     Mrs. Butterworth came to our classroom today to teach us about using an open number line to solve two-digit addition problems. An open number line is simply a line. To solve 46 + 50, just mark 46 at the left side of the line and use that as the starting point to count to 50 by tens, drawing a loop for each 10: 10, 20, 30, 40, 50. Now go back to the 46 and count using the loops: 56, 66, 76, 86, 96.


   To solve 49+35, write 49 at the beginning of the open number line and count up 35, using big loops for the tens and little loops for the ones. 10, 20, 30, 31, 32, 33, 34, 35. Now go back to the 49 and count using the loops: 59, 69, 79, 80, 81, 82, 83, 84. What a great math tool!