This week we started our new math unit on even, odd, prime, and composite numbers. A lot of the kids were confused as to why we were going over even and odd again when most of them already knew it. I explained that the main reason is that a lot of people confuse even and odd numbers with prime and composite numbers. First, we did an activity to review even and odd numbers. We all took tiles and lined them up into two columns, then recorded them in a table. We talked about how odd numbers had one tile leftover without a partner and even numbers all had a partner to dance with. We then talked about "third wheels" and "odd man out" and related this activity to being at a school dance, the leftover person standing sad in the corner with no one to talk to or dance with. Of course, I had to take advantage of the opportunity to belt out the song "All By Myself." (A couple people walked past the room excited because they thought Celine Dion was at school, but alas, it was just me ;) j/k). Our next activity had the kids determining if certain rules could be applied to even and odd numbers. When E= even number and O= odd number, they had to test different numbers to see what was true in each situation (see below): To prove each one, they had to list at least two number sentences per question.
For example, for Is the product of two odd numbers even or odd? It would look like this: 3 x 7= 21 5 x 3 = 15, so the product of two odd numbers is ODD. They then had to complete an exit ticket that required them to look at the problems as equations and determine which statements were true: E + E = O E + E = E E + O = E E + O = O O + O = E O + O = O Afterward, we put the following in our notebooks.
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