Base 4 Numbers

1. Most Difficult

1.1. Base 4 pieces

1.2. Subtraction

1.3. Multiplication

1.4. Division

1.4.1. Remainders

2. Closed?

2.1. Addition

2.1.1. Yes?

2.1.2. No?

2.2. Subtraction

2.2.1. Yes?

2.2.2. No?

2.3. Multiplication

2.3.1. Yes?

2.3.2. No?

2.4. Division

2.4.1. Yes?

2.4.2. No?

3. Connections

3.1. Foreign-ness

3.2. Place value

4. Thoughts about base 5

4.1. Similar

4.2. Different