Results for "how do you know?"

Does the Earth have an end?

Talking Math with Other People's Kids Month continues... A while back, Rafranz Davis reported a conversation on her blog. She writes frequently about the adventures she has with her nephew Braeden. I asked, and she gave me permission to remix a conversation she and...

Doll years

Out of the blue on our recent camping trip, Tabitha had an announcement for me. Tabitha (6 years old): I am 12 in doll years and Griffy is 16 in doll years. Her brother Griffin is 9. T: So how old are you in doll years, Daddy?Me: Well, how do doll years work? T: Well,...

Peeps

This is one of my favorite tasks in recent years. The idea is that we will compare two sets of Peeps. Are there more of one color or the other? There is so much fun to be had counting Peeps. Now that Valentine's Day is past, Peeps (a common Easter candy) are back in...

Legos

The dirty little secret about Legos is how very many pieces there are to be cleaned up after building. And how very ugly the clean-up battle can become. I try to keep calm. I try to turn the clean-up battle into math talk from time to time. Here is how it played out a...

The meanings of division

I was talking with Griffin one day when he was in third grade. Me: Do you know what $latex 12\div 2$ is?Griffin (8 years old): 6Me: How do you know that's right?G: 2 times 6 is 12. Me: What about $latex 26 \div 2$?G: 13Me: How do you know...