19 September 2006

RightStart Geometry

The continuing saga of our adventures using RightStart Geometry and RightStart B. I have a 10yo and a 6yo who have average math ability.The 10yo has done Miquon, Singapore, RightStart Transitions, Level D and Level E; RightStart has saved her from a life a math phobia.

On Tuesdays I upload an update of what we did in math for the week.

RightStart Geometry:

Lesson 54 Rectangles Inscribed in a Triangle

In lesson 53 Kid1 was unable to bisect a side of a triangle -- she forgot to draw a perpendicular back up to the line segment she was bisecting. I had showed her how to do it, and wondered whether she had really learned what to do.

The same thing happened in this lesson. This time it was a matter of a quick, “Remember, you go straight up here.” Ah. I think the lesson will sink in more with the repetition. I know I’m getting better at it.

Lesson 55 Connecting Midpoints in a Quadrilateral

Kid1 has a headcold. She stops frequently to get a tissue to wipe her nose. Every time she stops for tissue she tries to sneak a peek at The Sea of Monsters to read just a few more sentences. The lesson is interminable. She is to draw a quadrilateral, find the midpoint of each side, inscribe a new quadrilateral in it, measure the area of each, compare the two areas. This last bit involves using ratios, which clearly still puzzle her. It doesn’t help that her measurements are a wee bit off, giving her a ratio of 18 to 10. I prompt, “What is that a lot like?” Her mind is stopped up with snot. I suggest she stop after the first worksheet. She does.

The next day her head is clear. She knocks off the second worksheet in no time. She comments that it is much easier than she thought it would be.

Lesson 56 Introducing the Pythagorean Theorem

I always wanted to have more Montessori math manipulatives around when the kids were little. I thought it would be cool to play around with some of the Pythagorean stuff.

The lesson involves drawing squares, each using the side of the triangle as one side of the square, then comparing the areas. Easy. Kid1’s unsolicited comment: “This lesson was short and fun.”

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