Given an object not aligned to zero on a ruler, use the difference between two points to measure the object's length. Represent the concept of "difference" through the subtraction symbol. Given points include numbers between 0 and 25
A. Represent change in length as addition or subtraction
B. Add three measurements to find the total length of a path
C. Count to determine length of an object that isn't aligned to 0 on a ruler
D. Subtract to determine length of an object that isn't aligned to 0 on a ruler
F. Use a tape diagram to solve a +/- word problem involving length
G. Show the question/solution element of a word problem on a tape diagram and solve