Teacher presentation materials. Unit: 1.6 Length Measurements Within 120 Units (Grade 1). 1.6 Length Measurements Within 120 Units Unit Goals Students measure length and count up to 120 length units. They solve addition and subtraction story problems with unknowns in all positions. Section A Goals Compare the lengths of objects indirectly. Order objects by length. Section B Goals Count groups of up to 120 objects and write a number to represent them. Lay length units end-to-end with no gaps or overlaps and count the units to determine length. Section C Goals Solve addition and subtraction story problems with unknowns in all positions. Read More Lessons Resources Assessments Practic