
Home : 2002 : Feb : 15
I really like the Marilyn Burns' replacement units and she has one on place value. I have been teaching my students how to rewrite #s. For example, they rewrite 16 as 10+6, 14 as 10+4, 17 as 10+7 and then add up the 10s to get 30, see that 6+4 gives them another 10 which is 40 and then 7 left over = 47. I read the book "The King's Commissioners" to them (Aileen Freidman) and then we brainstormed a list of commissioners we would have to help our class on chart paper. Some jobs only needed one commissioner, while others required between 2 to 10 people to do the job. I circled all the #s of people we'd need that were listed next to each job and told the class to find out how many commissioners we needed in all. (For example, 7 people to pick up pencils that fall on the floor, 1 person to walk people to the nurse, 3 people to hang up backpacks that fall off their hooks...) Some students used math materials, some used tally marks and grouped them, some rewrote and simplified the #s to get the total... You could also use base ten blocks as well. We ended up with 100 commissioners for our class in all. They loved it, especially since we just celebrated the 100th day of school on Monday!
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