Let’s solve Problem #4 from the worksheet:
Problem 4: What is the mass of the block of iron illustrated below?
The diagram shows a rectangular block with dimensions:
- Length = 10 cm
- Width = 5 cm
- Height = 2 cm
We are told it’s made of
iron, and we can use the density chart to find iron’s density.
From the chart on the right side of the worksheet:
> Iron → Density =
7.87 g/cm³
---
Step 1: Find the volume of the block
Volume of a rectangular block = length × width × height
V = 10 cm × 5 cm × 2 cm
V =
100 cm³
---
Step 2: Use the density formula to find mass
Density = Mass / Volume
So, rearranged:
Mass = Density × Volume
Plug in the values:
Mass = 7.87 g/cm³ × 100 cm³
Mass =
787 grams
---
✔ Double-check:
7.87 × 100 = 787 — correct.
Units: g/cm³ × cm³ = grams — correct.
---
Final Answer:
787 g
Parent Tip: Review the logic above to help your child master the concept of density worksheet answers.
