Here is a puzzle we pose at our concerts.
Molly steps out of her tent. She walks south 1 km. Then west 1 km. She sees a bear. She gets scared and runs north 1 km, arriving back at her tent. How is this possible and what colour was the bear?
Listen to the song Parallel Lines from a grade 2 classroom that solves this puzzle. See an interview with their teacher.
Does this topic belong in a grade 2 classroom?” I think it does - after all children do live on a sphere, where parallel lines are much more interesting than parallel lines never meet.
It`s interesting that big ideas of math, like what parallel might mean, can be explored by really young children. It`s fun to explore math that has a low floor (you can engage with minimal math knowledge) and a high ceiling (it can be extended to very sophisticated mathematics).
“Low floor and high ceiling” rocks!