It depends on the orientation of the blocks.
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For blocks that are 450mm x 225mm , you will need 9.88 blocks per square metre.
are these concrete blocks and allowing for mortar. 12.5 per square metre, 62.5 per cubic metre with mortar
I understand such blocks come in different sizes.
20
The answer will depend on the orientation of the blocks. It will be between 13 and 25.