$7mm=\frac{7}{10}cm=0,7cm$

$1cm3mm=1\frac{3}{10}cm=1,3cm$

$2cm6mm=2\frac{6}{10}cm=2,6cm$

$7cm=\frac{7}{10}dm=0,7dm$

$1dm1cm=1\frac{1}{10}dm=1,1dm$