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About 12.
I understand such blocks come in different sizes.
12
What sort of blocks? Childrens' building blocks? If so, how big is each block?
The answer will depend on the orientation of the blocks. It will be between 13 and 25.
10 cm = 0.1 meter 20 cm = 0.2 meter Each block covers (0.1 x 0.2) = 0.02 square meter. To cover 12 square meters, you need 12/0.02 = 600 blocks.
Depends on the linear dimensions of both the slabs and the ground.
About 12.
I understand such blocks come in different sizes.
There are many places where one can purchase block paving bricks in bulk. This includes retailers such as Westminster Stone, Barton Fields, Marshalls and many more.
12
1x1 meter is a square meter.
600mm is 0.6m, and 450mm is 0.45m, so one flag is 0.27 sq metre. Therefore 4 flags to the square metre
What sort of blocks? Childrens' building blocks? If so, how big is each block?
The answer will depend on the orientation of the blocks. It will be between 13 and 25.
There are many sites that offer insight and even tutorials for block paving from home. Examples include Wisegeek, DIY Doctor, Amazon's Askville section, and Money Saving Expert.
A standard block is 440mm x 215mm x 100mm you will require 10 blocks per square metre.