Texas Math Models

Try “number line” or “4.5D”

Part and part, whole unknown

part + part = whole

G3

3rd grade brought 248 cans and 4th grade brought 175. How many in all??2481753rd grade4th gradeboth parts known, so the bar is one additionthe diagram becomes the equation248 + 175 = ?= 423423 cans in alllabel both parts, mark the whole with ?, then write the addition

How this one works

How

draw one bar, split it into the two parts, and mark the whole with ?.

Best when

you know both parts and want the total.

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