Question

add using models 3
add the two decimal models.
use the sketch to help you.
what is their total?

Explanation:

Step1: Identify first decimal

The top model is a 10-column strip (tenths place), with 6 shaded columns. So it represents $0.6$.

Step2: Identify second decimal

The bottom model is a 100-grid (hundredths place), with 12 shaded squares. So it represents $0.12$.

Step3: Add the two decimals

$$0.6 + 0.12 = 0.72$$

Answer:

0.72