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Exploring Equality and Composing Numbers

I’ve been working with my Firsties on the following TEK: 1.2(A) recognize instantly the quantity of structured arrangements Although it is not mentioned in the TEK, the mathematical word for this skill is subitizing. The dot patterns on dice and dominoes are...

Composing 10 Online Game

As we wind down to the end of the school year, I’ve been looking for ways to keep my students engaged while still ensuring that each lesson includes worthwhile learning. That’s the tricky balancing act, right? I recently stumbled across an wonderfully...

Developing Part/Whole Thinking

I’ve been working with my firsties on composing and decomposing the numbers 3, 4, and 5.  Last week, I used number bond cards and manipulatives–linking cubes and ten-frames–to introduce the idea of number bonds.  Read more about that here.  Over the...

The Power of Part/Whole Thinking

Last week I blogged about some work I did with a group of 5th graders on perimeter.  There was one problem I wanted to expand on a little.  This is the problem: I think you can see where the rigor comes from in this problem.  Rather than knowing the length and width...

Identifying Coins and Exploring Coin Relationships

I planned with 1st grade yesterday, and they are getting ready to tackle money.  In Texas, 1st graders need to be able to identify coins, know the values of the coins, and understand relationships between the coins (1 nickel has the same value as 5 pennies). I read...