Shelly sews a blanket that has an area of 170 square feet. It has 30 square blocks, each the same size. What is the approximate length of each side of a block?

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To find the approximate length of each side of a block, we can divide the total area of the blanket by the number of blocks.

1. Start by finding the length of a side of a block:
- Area of the blanket = 170 square feet
- Number of blocks = 30

2. Divide the total area of the blanket by the number of blocks to find the area of a single block:
- Area of a single block = Area of the blanket / Number of blocks
- Area of a single block = 170 square feet / 30 = 5.67 square feet (approx.)

3. Since the area of a square is calculated by multiplying the length of one side by itself, we can find the length of each side of the block:
- Length of a side of a block = √ Area of a single block
- Length of a side of a block = √5.67 square feet

Therefore, the approximate length of each side of a block is √5.67 square feet.