Teaching Logic Inferences

This is foamcore.

I found large sheets of foamcore at Wal-mart for under $5,  I sliced some  2″ strips, out of which I cut rectangles of varying sizes. All/No doesn’t need a big rectangle, but P/non-P does.

I also found magnet strips in the craft section.  They are backed with tape, and can be cut to make the teacher pieces.

All S is P.

Okay.  I’ll show you how I do the Contrapositive.

Do the Obverse: “pull down” the All to No…

…and the P to non-P.

This results.

Slapping these cards on the metallic whiteboard is very satisfying.

Now we switch S and non-P by Converse, and get this.

By Obverse again we get the final result.

About lettersfromheartscontent

Mother of six, wife to a forester and educator, formerly homeschool teacher and tutor with Classical Conversations. Now teaching music at a small Christian school. I enjoy dabbling in acrylic paints in my spare time, composing for my family and for my choir, and visiting with my family regularly on Hangouts.
This entry was posted in Classical Conversations and tagged , , . Bookmark the permalink.

6 Responses to Teaching Logic Inferences

  1. Michelle says:

    Love it! Great for hands on kids!

  2. Very cool! Simple and memorable!

  3. Bethany Barnard says:

    Thank you Ruth. This is exactly what I was looking for.

  4. Gayla says:

    What’s on the back of “is”?

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s