Not sure what you mean by "standard form"; one way to write this is as 120 µm.
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12 ten thousands = 120 thousand = 120,000
sqrt(120)factor under the radicalsqrt(22 * 30)= 2sqrt(30)=========
Because 1 metre = 100 cm so that 12 metres = 1200 cm and, as even a child knows, 1200 is bigger than 120!
√120 = √4√30 = 2√30
A triangular number counts the objects that can form an equilateral triangle. 121 is not a triangular number, though 120 is.