The other morning my daughter, somewhat out of the blue, demonstrated her understanding of estimation. She was looking through a stack of picture books for something to read during breakfast. She called out to: "Mom, what's three eights and one five?"
I had to go look to figure out what she was talking about. She had counted the bottom eight books and measured the height of that part of the stack with her fingers. Then she moved her fingers up to find two other same-size sets, and then counted the remaining books at the top of the stack. Then she counted the actual books, to see how close she was. It was pretty good - the estimate was 29 and the actual number of books was 31.
I think that she picked up on the idea of estimation from two different places. First, there's an early reader that we enjoy called Gumballs: A Mr. and Mrs. Green Adventure (link goes to full review). In this title, an alligator uses estimation to win a contest (guessing the number of gumballs in a jar). Second, her kindergarten class did a math project a couple of weeks ago involving little bags of M&Ms. The teacher asked the kids to estimate the number that they would find in their bags. So she had the idea of estimating in her head, though we hadn't discussed it recently at home.
Estimation is a useful skill, so I was pleased to see my daughter using it. Thanks for reading! I hope that some of you will find this of interest.