Here are three proper fractions, each with a corresponding shaded rectangle to visualize them:

1. 1/4

   • Fraction Explanation: One part out of four total parts is shaded.
   • Visualization: A rectangle is divided into four equal parts, and one of these parts is shaded.

2. 2/3

   • Fraction Explanation: Two parts out of three total parts are shaded.
   • Visualization: A rectangle is divided into three equal parts, and two of these parts are shaded.

3. 3/5

   • Fraction Explanation: Three parts out of five total parts are shaded.
   • Visualization: A rectangle is divided into five equal parts, and three of these parts are shaded.

If you'd like, I can generate images showing these fractions using shaded rectangles to help visualize them. Would you like me to create those images?

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Here are five questions to help deepen your understanding:

1. What makes a fraction "proper" compared to "improper"?
2. How do you convert a proper fraction into a decimal?
3. Can you represent the fraction 4/5 with a shaded rectangle?
4. What are equivalent fractions to 1/4?
5. How can you simplify the fraction 3/5 further, if possible?

Tip: A proper fraction always has a numerator smaller than the denominator.