Texas Math Models

Try “number line” or “4.5D”

Hundredths grid

2.45 + 1.8 = 4.25 Grade 4

a whole square = 1 · a small square = one hundredth 2.451.80 + 1145 hundredths 180 hundredths = 0.80 3 whole squares · 45 + 80 = 125 hundredths 125 hundredths = 1 whole and 25 hundredths 4 wholes and 25 hundredths = 4.25

How this one works

How

shade the hundredths for each number, then count them all together.

Best when

you are not sure 0.8 and 0.80 are the same.

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