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The square root of 2025?
45 45X45=2025
How may paving flags would you need for a square meter if my flags are 300mm x 300mm?
A square meter is 100x100 which means there are 10000 sq cm in a sq meter. Your blocks are 450mmx450mm which means that they are 45cm x 45 cm 45x45=2025 10000/2025= 4.94 paving flags. However, you might want to calculate the amount of blocks needed for the entire area you're paving, not for each meter. Always remember to round up and leave yourself some extras, Keep in mind that you may need to leave some gap between the blocks, and that doing so may help you use fewer blocks. For example if you are paving an ally a meter wide, then leaving a gap of three centemeters at the sides of the ally and three centemeters betweed the blocks will mean you get away with using two blocks width and don't need to cut any blocks (which would be a pain in the neck).
