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Two gears in a system rotate in opposite directions. What happens when you add another gear?

There are lots of ways to add to nine, but is it possible to make it happen twice in this puzzle?

Even without knowing the measure of any one angle, we can sometimes find relationships between them. What are these angles?

When static friction fails, how many books will land on your hand?

Mathematics is the art of reasoning about patterns, and not all patterns are numerical. What completes this pattern?

Sometimes, extending sides and breaking up overlapping shapes can help us see more than what we were told.

In a Number Bunchers puzzle, you might need to consider multiple constraints at once. How are these tiles distributed?

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