To find the side length of each square given the area, you use the formula for the area of a square:

$\text{Area} = \text{side length}^2$

To find the side length, you take the square root of the area:

$\text{side length} = \sqrt{\text{Area}}$

Let's calculate each one step-by-step:

1. For 64 cm²:

$\text{side length} = \sqrt{64} = 8 \, \text{cm}$

2. For 100 m²:

$\text{side length} = \sqrt{100} = 10 \, \text{m}$

3. For 81 m²:

$\text{side length} = \sqrt{81} = 9 \, \text{m}$

Summary of Calculations:

1. 64 cm² → Side length = 8 cm
2. 100 m² → Side length = 10 m
3. 81 m² → Side length = 9 m

Would you like to see more details or have any questions?

Here are some related questions you might find interesting:

1. How do you find the area of a square if only the perimeter is given?
2. What happens to the side length if the area of a square is doubled?
3. How does changing the units (e.g., from cm² to m²) affect the side length calculation?
4. What is the side length of a square with an area of 144 cm²?
5. How do you calculate the side length of a square if the diagonal is given?

Tip: Always remember to match the units of measurement in your calculations for consistent results!