Tag Archives: Parallel Lines

Day 75: Bingo!

Today, algebra reviewed finding the equation of a line when given two points for a concept test tomorrow. A few months ago, I came across this post over at Everybody is a Genius. The idea had been sitting in my bookmarks for way to long so I gave a try.

I used pretty much the exact format explained in the post. Random.org  was my go to for generating the numbers and I created my own template for the board.

As a class we worked through a few of the difficult ones with fractions as y-intercepts as they came up and took some time to discuss ordered pairs with x-values of 0.It is true that by the end of the period students were begging for just one more question.

IMG_0516Here are the goods…

Bingo Sheet

24 Problems

I had a fun time watching students work through this review. I may have had even more fun telling them about watching older folks play bingo on cruise ships when growing up.

Day 43: Constructing Parallel Lines

Today in Geometry I asked students to draw a line then create another parallel to it.

There were a lot of crazy constructions.

Some students drew a line then used the opposite side of the straight edge to construct a parallel line. Others copied angles or used an insane amount of circles. Here’s one of those methods:

*Students were using a straight edge and compass

Start with a line segment


Construct a circle whose radius spans more than half the segment.


Copy that same circle, this time centered and the other endpoint. (they just made a perpendicular bisector…)


Copy the same circle again, but make it just touch point B and do the same for the A side also.

Day44.3Connect the first intersection of the circles to the third.


There are a few points that I am uneasy with here but this particular student created a parallel line; doing exactly what they were asked to do. They also created an isosceles trapezoid, which is pretty awesome.

Here is the big question… if this method were used on a test would you mark it correct?