using numbers up to 100
저자: Josie Woolever
1. adding with numbers to get 1000
1.1. give students examples of how to do this
1.2. give students an explanation of how to do this by providing a walk through
2. subtracting with numbers to get from zero
2.1. give students examples of this
2.2. give students an explanation of how to do this and provide them a walk through