Question

3100*710
1 110:1 21100

Answer 1

$displaystyle tt frac{3}{100}cdotfrac{7}{10}=frac{21}{1000}=0,021\\\1frac{1}{10}:1frac{21}{100}=frac{11}{10}:frac{121}{100}=frac{11}{10}cdotfrac{100}{121}==frac{11}{10}cdotfrac{10cdot10}{11cdot11}=frac{10}{11}$