Instead of multiplying 490 x 20, "the street sellers might multiply 500 x 20 & then remove 10 of the 20s, or 200. Schoolchildren, by contrast, are prone to making lengthy pencil & paper calculations using an algorithm for multiplication. They often don’t see a more efficient way to solve a problem." - ThreadSky | a Reddit-style client for Bluesky

inv3math.bsky.social • 4 days ago

Instead of multiplying 490 x 20, "the street sellers might multiply 500 x 20 & then remove 10 of the 20s, or 200. Schoolchildren, by contrast, are prone to making lengthy pencil & paper calculations using an algorithm for multiplication. They often don’t see a more efficient way to solve a problem."

Reposted from The Hechinger Report

These teens can do incredible math in their heads but fail in a classroom

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