Step by step
The question
Question: find the density when the mass is 56 g and the volume is 8 cm³.
Mass 56 g, volume 8 cm³. Find the density.
1 Write the rule
The rule: density is the mass divided by the volume.
density = massvolume
Density tells us how much mass there is in 1 cm³.
So its unit is g per cm³.
density = the mass of 1 cm³
unit: g ÷ cm³ → g/cm³
2 Put the numbers in
The mass is 56.
The volume is 8.
d = 568
3 Work it out
Careful!
The mass goes on the top.
The unit, g/cm³, shows it: g on the top.
Careful: not 856 ✗
56 divided by 8 is 7.
density = 7 g/cm³
So the density is 7 g/cm³.
4 Check
Let's check.
7 in each cm³, for 8 cm³: 7 times 8 is 56.
That is the mass.
So the answer is right!
7 g in each cm³: 7 × 8 = 56 g
Let's look back.
First: write the rule.
Then: put the numbers in.
Then: work it out.
Last: check.
Answer
density = 7 g/cm³