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2. Cut shapes into equal parts in Cut and Slice on Games.com - AOL

   www.aol.com/news/2013-02-09-cut-and-slice-games...

   While Cut and Slice has an incredibly simple premise, it quickly becomes a challenging game that's worth playing due to its unique design. If you'd like to test your brain, you can now play Cut ...

3. Missing square puzzle - Wikipedia

   en.wikipedia.org/wiki/Missing_square_puzzle

   The apparent paradox is explained by the fact that the side of the new large square is a little smaller than the original one. If θ is the angle between two opposing sides in each quadrilateral, then the ratio of the two areas is given by sec 2 θ. For θ = 5°, this is approximately 1.00765, which corresponds to a difference of about 0.8%.

4. Divide and choose - Wikipedia

   en.wikipedia.org/wiki/Divide_and_choose

   Divide and choose (also Cut and choose or I cut, you choose) is a procedure for fair division of a continuous resource, such as a cake, between two parties. It involves a heterogeneous good or resource ("the cake") and two partners who have different preferences over parts of the cake (both want as much of it as possible).

5. Pizza theorem - Wikipedia

   en.wikipedia.org/wiki/Pizza_theorem

   Let p be an interior point of the disk, and let n be a multiple of 4 that is greater than or equal to 8. Form n sectors of the disk with equal angles by choosing an arbitrary line through p, rotating the line ⁠ n / 2 ⁠ − 1 times by an angle of ⁠ 2 π / n ⁠ radians, and slicing the disk on each of the resulting ⁠ n / 2 ⁠ lines.

6. Proportional cake-cutting with different entitlements - Wikipedia

   en.wikipedia.org/wiki/Proportional_cake-cutting...

   The cut-near-halves algorithm is not always optimal. For example, suppose the ratio is 7:3. Cut-near-halves may need at least four cuts: first, George cuts in the ratio 5:5, and Alice gets 5. Then, Alice cuts in the ratio 3:2; suppose George chooses the 2. Then, George cuts in the ratio 2:1; suppose Alice chooses the 1.

7. Manipulative (mathematics education) - Wikipedia

   en.wikipedia.org/wiki/Manipulative_(mathematics...

   It is critical that students learn math concepts using a variety of tools. For example, as students learn to make patterns, they should be able to create patterns using all three of these tools. Seeing the same concept represented in multiple ways as well as using a variety of concrete models will expand students’ understandings.