Texas Math Models

Try “number line” or “4.5D”

Comparison

the gap between two bars

G3

3rd grade brought 248 cans and 4th brought 175. How many more did 3rd bring?3rd grade2484th grade175?line them up at the left end or the gap lies“how many more” is still a subtraction248 − 175 = ?= 733rd grade collected 73 morenothing was taken away here, and it is a subtraction anyway

How this one works

How

draw two bars starting at the same line; the extra bit is the answer.

Best when

the question asks how many more or how many fewer.

seen one of these on a test? See it on a real question: TEKS 4.5A, multi-step problems with a strip diagram.

The same problem, other ways