900cm²+4m²+6dam²=........dm²

[tex] {900cm}^{2} \div 10 = 90dm \\ {4m}^{2} \times 10 = 40dm \\ {6dam }^{2} \times 100 = 600dm \\ {900cm}^{2} + {4m}^{2} + {6dam}^{2} = {730dm}^{2} [/tex]
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900cm² + 4m² + 6dam² =.......dm²
= 900÷100 + 4×100 + 6×10.000
= 9dm² + 400dm² + 60.000dam²
= 60.409dm²