number sense

1. standard counting

1.1. by ones

1.1.1. by tens

2. grouping

2.1. separating

2.1.1. sorting

2.1.1.1. comparing

3. recognizing numbers

3.1. writing

3.2. adding

3.2.1. subtracting

4. real world

4.1. time

4.1.1. money