Mainly because we count in tens. We use the decimal representation which is a way of representing a number in such a way that the place value of each digit is tentimes that of the digit to its right. This probably originates from the fact that we have ten digits (fingers and thumbs).
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10
SI is a base 10 standardized system
si units are based on the metric system system international (French) international system (English)
Yes, it is recommended because the SI-units are based on the metric system.
International System of Units (SI)