None.
A decimal (if that is what you were trying to spell) is a representation of a number: it is not a measure of area nor any other characteristic.
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9.
At least one, provided he is not enormous.
Since 12" by 12" is one foot by one foot or one square foot, 1237 of these tiles will feet in 1237 square feet.
To determine how many blocks of size 390mm x 190mm fit in a square meter, first convert the block dimensions to meters: 0.39m x 0.19m. The area of one block is 0.39m * 0.19m = 0.0741 square meters. Since one square meter equals 1 square meter, you can fit approximately 13.5 blocks (1 / 0.0741) in a square meter. Therefore, you can fit 13 blocks completely, with some space left over.
You measure how many units will fit inside of the area. For example, if you own a plot of land and want to know the area in square feet, construct a lot of squares that are one foot square. Then put as many of those square as will fit into the plot without any overlapping or any gaps. Count the number of squares that fit into the plot.