Texas Math Models

Try “number line” or “4.5D”

Place-value chart · decimal disks

2.45 + 1.8 = 4.25 Grade 4

OnesTenthsHundredths 10.10.01 2.451.80 + 10 tenths = 1 one · 2 tenths left 4.25 1.8 has no hundredths: that column is simply empty

How this one works

How

put each digit in its column, then trade ten tenths for one whole.

Best when

you want to see why the trading works.

seen one of these on a test? See it on a real question: TEKS 4.4A, adding and subtracting decimals, or TEKS 4.2G, decimals and fractions that mean the same thing.

The same problem, other ways