This worksheet helps students practice calculating total mass by summing the values shown on the three beams of a triple balance scale.

Let's solve each of the three triple beam balance readings step by step. A triple beam balance has three beams, each with a sliding weight (rider) that measures mass in different increments:

- Top beam: 0–100 grams (in 10g increments)
- Middle beam: 0–500 grams (in 100g increments)
- Bottom beam: 0–10 grams (with smaller divisions, usually 0.1g)

We add the values from all three beams to get the total mass.

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1. First Set

Top beam (100g scale):
- The rider is at 80g

Middle beam (500g scale):
- The rider is at 200g

Bottom beam (10g scale):
- The rider is at 4.5g (between 4 and 5, halfway → 4.5)

✔ Total mass = 80 + 200 + 4.5 = 284.5 grams

> ✔ Answer: 284.5 g

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2. Second Set

Top beam:
- Rider is at 30g

Middle beam:
- Rider is at 150g (between 100 and 200, but closer to 150? Wait — let's check carefully.)

Wait! Actually:
- The middle beam goes from 0 to 500 in 100g increments.
- The rider is at 100g, not 150.

Wait — look closely:
The rider on the middle beam is aligned with 100g, not between.
So it’s 100g.

Bottom beam:
- Rider is at 3.4g (just past 3, near the 4th small mark — each small mark is 0.1g, so 3.4g)

✔ Total mass = 30 + 100 + 3.4 = 133.4 grams

> ✔ Answer: 133.4 g

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3. Third Set

Top beam:
- Rider is at 60g

Middle beam:
- Rider is at 500g

Bottom beam:
- Rider is at 7.6g (just before 8, at the 6th small mark after 7 → 7.6g)

✔ Total mass = 60 + 500 + 7.6 = 567.6 grams

> ✔ Answer: 567.6 g

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✔ Final Answers:

1. The mass is 284.5 g
2. The mass is 133.4 g
3. The mass is 567.6 g

All values are in grams (g), which is the SI unit for mass.

Let me know if you'd like a visual explanation or how to read the scales more precisely!