Model numbers with more than 9 ones or 9 tens; write in expanded, unit, standard, and word forms

In this lesson, students use place-value disks to represent numbers in two ways when there are more than 9 ones or 9 tens, e.g.,1 hundred 5 tens 2 ones and 15 tens 2 ones. Then they write the numbers in expanded, unit, standard, and word forms.