- Order-3 Magic Squares
- Triangle Numbers
- Square Triangles
- Right Triangles with Legs that Differ by 1
- Reversible Factors and Multiples
- Concatenated Squares
- Liar's Paradox
- Pythagorean Triples
- Songwriting with Backwards Long Division
- String Art Math
- Families of Lines Tangent to a Curve

- Square of the Difference of two numbers is their Sum
- Difference of the Squares of two numbers is their Sum
- Sum of Two Numbers is a Multiple of their Difference
- The Product of Two Numbers is a Multiple of Their Sum