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All non-zero digits are significant. Zeros between non-zero digits are significant. Leading zeros (zeros to the left of the first non-zero digit) are not significant. Trailing zeros in a number containing a decimal point are significant.
10x21=210
210 millimeters is approximately 8.27 inches wide.
210 ml of water is equal to 14 tablespoons.
210 meters = 0.13048795 miles