Compare the lengths of two objects, using the shorter object as a non-standard unit of the longer item. Then, learn why using two similar non-standard unit can result in different length of the same object
A. Count to measure lengths of objects in non-standard units
B. Measure lengths of objects from endpoint to endpoint with no gaps or overlaps
C. Measure lengths of objects by laying non-standard units correctly
E. Count to measure lengths of objects in centimeters
F. Measure lengths of objects aligned to a centimeter ruler
G. Align objects to a centimeter ruler to measure length
H. Draw a line segment of a given length
I. Measure side lengths of 2-D objects using a centimeter ruler