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Dear Joan,
Thanks for clarifying our question about cm squared.
Also, regarding pi, I think Liam could see the similarity to the problem in Lesson 78.
It helped ME to know that pi is NOT really a variable. He substituted 3 for pi and then I had him show me how to solve it. When he said he still didn't understand why you couldn't do 600(6), I was then able to discuss order of operation as Nancy suggested. I told him that was a Math rule.
But we also looked at it visually. I had him demonstrate 2 x 3 + 4 x 3 with cubes. He could see that 6 cubes + 12 cubes = 18 cubes. Then I had him demonstrate how 6 cubes x 3 cubes also equals 18 cubes. Then I had him demonstrate his thinking: 6 cubes x (6 cubes) which does not work, of course, because he didn't have enough cubes!
I think he finally gets it.
Thanks for your help on this sticking point.
Julia
Thanks, Liam
