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5th Grade

Deeper reading, structured writing, fractions, and multi-step problem solving

Worksheet for 2026-09-21

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📖 Why Muscles Work in Pairs

Skeletal muscles pull when they contract; they do not actively push. At many joints, opposing muscles create movement in different directions. In the upper arm, the biceps helps bend the elbow while the triceps helps straighten it. Coordinated muscle pairs allow controlled movement.

1. What key idea begins the explanation?

 

2. What mechanism or supporting detail is described?

 

3. What additional evidence or effect is given?

 

4. How does the final detail deepen the explanation?

 

✏️ Writing

Write 1–2 developed paragraphs explaining why muscles work in pairs. Use evidence and cause-and-effect reasoning.

➕ Math

1. Convert 3.5 meters to centimeters: ______
2. How many ounces are in 2 pounds? ______
3. How many minutes are in 3.5 hours? ______
4. Which unit would best measure the volume of a swimming pool? __________________

🎨 Color & Create

Create a labeled model or diagram that explains why muscles work in pairs.

View Answer Key

📖 Reading Answers

  1. Skeletal muscles pull when they contract; they do not actively push.
  2. At many joints, opposing muscles create movement in different directions.
  3. In the upper arm, the biceps helps bend the elbow while the triceps helps straighten it.
  4. Coordinated muscle pairs allow controlled movement.

➕ Math Answers

  1. 350 cm
  2. 32 oz
  3. 210 minutes
  4. Gallons or liters

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