Harder concepts from Mathcounts Mini :
Also try the follow-up problems with detailed solutions. Don't do every question. Just the ones you think is hard.
Geometry :
#27 : Area and Volume
#30: Similar Triangles and Proportional Reasoning
#34: Circles and Right Triangles
#35: Using Similarity to Solve Geometry Problems
#41: Analytic Geometry : Center of Rotation
More questions to practice from my blog post.
From Mathcounts Mini : Video tutorials on counting and probability for Mathcounts state/national prep concepts are in the of difficulty.
Counting the Number of Subsets of a Set
Constructive Counting
More Constructive Counting
Probability and Counting
Probability with Geometry Representations : Oh dear, the second half part is hilarious.
Probability with Geometry Representations : solution to the second half problem from previous video
Try this one from 1998 AIME #9. It's not too bad.
From Mathcounts Mink : Center of rotation, equal distance from a point to other two points or two lines, angle bisector (last problem on the follow-up worksheet)
Mathcounts Mini : #41 - Analytic Geometry
Monday, January 26, 2015
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