4. It took Marie 10 minutes to saw a board into 2 pieces. If she works just as fast, how long will it take her to saw another board into 3 pieces?
20 minutes X
Answer: 15
Teacher: I think you're wrong there. You see, in order to cut a board in to 2 pieces, you make 1 cut. To cut a board in to 3 pieces, you make 2 cuts. 20 minutes is right.
Any teachers out there want to fess up to making similar mistakes? Comment on this post! Or better yet, scan the document and email it to me!
You're right!
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