Grades 1-2 Video Solutions 2023-2023_1-2

Video Transcription

Problem number 15. A student made the shape shown using 12 cubes. He put one drop of glue between any two cubes that share a common face. How many drops of glue did he use?  We're going to start on this end of the shape, and we're going to count where one face touches another, because that's where the drops of glue are.  So this cube touches just one cube here, so there's one drop right there. Then this cube touches one more cube, it's another one, and this cube touches another one here.  This cube also touches another one here. This cube touches another one. It's five so far. Now this cube touches two other cubes in addition to the one on its left.  So that's two more drops of glue. And coming forward, this cube touches one more cube right there. So backing up, this cube touches one more cube here.  This cube touches another one on top. And this cube touches one more here. So look at our telemarks, 5, 5, and 1 makes 11. The answer is D.

Video Summary

A student used 12 cubes to form a shape, applying glue between cubes that shared a face. The task was to determine the total drops of glue used. The method involved counting each instance where one cube's face touches another. Starting from one end of the shape, the count of touching faces was recorded, resulting in a total of 11 drops of glue needed. Thus, the answer is 11 drops of glue.