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I understand such blocks come in different sizes.
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OMG do you actally think this is a sensible question
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The number of concrete hollow blocks in 1 square meter depends on the size of the blocks. For example, if the blocks are 20cm x 20cm x 40cm, which is a common size, you would need 25 blocks to cover 1 square meter (assuming no gaps or mortar). This calculation is based on the fact that each block covers 0.04 square meters (0.2m x 0.2m) of surface area. It's important to consider the dimensions of the blocks and the desired layout to determine the exact number needed.