So what is it? [Students give the answer.] And does the magic sum still Yes! work? Possible student question: but the top and why don’t right squares have like +’s the first two? [Answer: rotations and reflections.] [Groans.] OK, now turn to the let’s corners (pardon the pun), starting with the first magic square on the board. How do we go from 5 to 2? Subtract 3! How do we go from 5 to 8? Add 3!
OK, let’s now turn to the corners (pardon the pun), starting with the first magic square on the board. So what is it? And does the magic sum still work? How do we go from 5 to 2? How do we go from 5 to 8? [Students give the answer.] Yes! Possible student question: but why don’t the top and right squares have +’s like the first two? [Answer: rotations and reflections.] [Groans.] Subtract 3! Add 3!