Question

which model shows the sum of 0.1 and 0.8? choose 1 answer: a image of a square with colored sections b image of a rectangle with colored sections

Explanation:

Step1: Calculate the sum

First, find the sum of \(0.1\) and \(0.8\). Using the addition of decimals, \(0.1 + 0.8 = 0.9\).

Step2: Analyze the models

• For model A: The square is divided into 10 equal parts (since it's a decimal model, likely tenths). The purple part is 1 tenth (\(0.1\)) and the blue part is 8 tenths (\(0.8\)). Together, they cover \(0.1 + 0.8 = 0.9\) of the square (9 out of 10 parts).
• For model B: The length of the bar or the number of parts doesn't seem to represent the sum of \(0.1\) and \(0.8\) as clearly (or the total would not be 0.9 based on the visual). So model A shows the sum of \(0.1\) and \(0.8\).

Answer:

A