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, homeschool teacher, tutor with Classical Conversations, wife to a forester and educator. I tend a perennial garden with a riot of blossoms, ride my bicycle in and out of the watershed, play ocarina and a boom-chick accompaniment when my kids feel like playing contradance music. I love being home, but I love an open road and adventure, too. Classical Conversations' Writers Circle carries my article on some aspect of classical education once a month.
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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”?

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