To solve the problem, we need to interpret the information given about the models representing decimals.
From your description:
- One model has 3 whole lines of ten filled, which means it represents 3.0.
- Another model has 4, but since the rest is blank, it appears that it also represents 0.4.
Now let's add them together:
3.0 + 0.4 = 3.4
However, if we are trying to find the total represented by two decimal models where each model represents fractions of a whole, we might need to reassess based on the typical decimal expressions.
If a model represents a single unit (1), then:
- 3 lines of ten filled suggests it is actually whole (3).
- Any additional partial represents a decimal figure.
Thus, considering the decimal addition represented in your options (0.7, 0.8, 1, and 0.9), we find that the total number represented will fit based on how you've described their filling fractions if each model is less than 1 unit:
To conclude based on the information provided, please clarify regarding the 4 (blank) after that. It seems there may be an interpretive mismatch, which makes it hard to determine if we need to be summing to produce a decimal output.
Please clarify how the fractions are depicted to provide a better conclusion!