Texas Math Models

Try “number line” or “4.5D”

Open number line · up or back

625 − 258 = 367 G3–G4

258260300600625 +300+40+25+2 Count up until you reach 625; add the jumps: 2+40+300+25=367 367375425625 −200−50−8 Remove 258; take away: 200+50+8→367

How this one works

How

count up from 258 to 625, or count back 258 from 625.

Best when

you like working it out in your head.

seen one of these on a test? See it on a real question: TEKS 3.4A, adding and subtracting to 1,000.

The same problem, other ways