A tonne is a unit of mass; a square meter is a unit of area. You only "convert" units of the same kind.
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Divide by 9.81
Multiply by the amount of square metres
As squared meters are two-dimensional and cm are one- dimensional it is not possible. If you meant cm squared then: 1 Meter squared = 10000 Centimeter squared. Using this you can use simple multiplication to convert.
To convert cubic meters of asphalt to tons, you need to know the density of the asphalt, which typically ranges from about 2,200 to 2,400 kg/m³. Multiply the volume in cubic meters by the density to get the mass in kilograms, then divide by 1,000 to convert to tons. For example, if the density is 2,300 kg/m³, then 1 cubic meter of asphalt would equal approximately 2.3 tons.
You either divide the giganewton by one million or one thousand. I think it's one million. so it would be a millionth of a newton, or 0.000001 N.