There are 4 problems above:
Problem 1 (Monday) says the postman brings you 3 checks (+ 3) for $2 each ( + 2) ; are you richer or poorer as a result? The checks are for your birthday, that adds $6 to your bank balance = (+ 6). So we write that as + 3 x + 2 = + 6 (you have $6 more)
Problem 2 (Tuesday) says the postman takes away 3 ( -3 ) (they really belong to the lady upstairs), checks for $2 each ( +2) ; are you richer or poorer as a result? you have $6 less than before he came. So we write that as -3 x + 2 = -6
Problem 3 (Wednesday) says the postman brings you (+ 3) bills for $2 each ( -2 ); are you richer or poorer as a result? You have $6 less than before he came. So we write that as +3 x -2 = -6.
Problem 4 (Thursday) says the postman takes away 3 ( -3 ) , bills for $2 each ( -2) (they really belong to the lady upstairs). So taking away the $6 in bills, adds $6 to your bank balance. So we write that as -3 x -2 =+6.
"Mr. Cohen, I felt like I was channelling yesterday when Maggie and I got involved in figuring out how many pieces there were in the huge lego pyramid she had built. My favorite part was when she realized that there was a quicker but less interesting way to do the calculations, and she said, "Let's do it the longer way! It's more fun!"
I posted a photo of the pyramid and tagged you in it. I'm not sure if it's readable, but that white piece of paper says "10.404'
Donald Cohen: your pyramid is a marvel, Maggie! It looks like an Egyptian pyramid. I like the idea of doing something the longer way, but more fun in the process. Is the pyramid made by the squares of even numbers? Like 2^2=4, 4^2=16, 6^2=36?
Jennifer Olinger (a friend): Wow! That's impressive! Is that number (10,404) the number of Lego bricks she used?
Barbara: Not the number of bricks, the number of dots. A spontaneous unschooling math project.