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$1 {cm}^{2} = 100 {mm}^{2} \\ 1 {dm}^{2} = 100{cm}^{2} \\ 1 {m}^{2} = 1000000 {dm}^{2} \\ 1 {m}^{2} = 10000 {cm}^{2} \\ 1 {mm}^{2} = 0.01 {cm}^{2} \\ 1 {cm}^{2} = 0.01 {dm}^{2} \\ 1 {dm}^{2} = 0.01 {m}^{2} \\ 1 {cm}^{2} = 0.0001 {m}^{2}$

$7 {m}^{2} 13 {dm}^{2} = 7.13 {m}^{2} \\ 10 {dm}^{2} 8 {cm}^{2} = 8.1 {cm}^{2} \\ 36 {cm}^{2} 1 {mm}^{2} = 36.1 {cm}^{2} \\ 40 {m}^{2} 4386 {cm}^{2} = 83.86 {m}^{2} \\ 15 {m}^{2} 4 {dm}^{2} = 4.15 {dm}^{2} \\ 3 {cm}^{2} 10 {mm}^{2} = 3.1 {cm}^{2}$

$16 {m}^{2} 4 {dm}^{2} + 5 {m}^{2} 43 {dm}^{2} = 16.04 {m}^{2} + 5.43 {m}^{2} = 21.47 {m}^{2} \\ 70 {dm}^{2} - 36 {cm}^{2} = 0.7 {cm}^{2} - 36 {cm}^{2} = - 35.3 {cm}^{2} \\ 100 {cm}^{2} - 14 {cm}^{2} 7 {mm}^{2} = 100 {cm}^{2} - 14.07 {cm}^{2} = 85.93 {cm}^{2} \\ 35 {m}^{2} 4 {dm}^{2} \times 15 = 35.04 {m}^{2} \times 15 = 525.6 {m}^{2} \\ 84 {dm}^{2} 12 {cm}^{2} \div 6 = 84.12 {dm}^{2} \div 6 = 14.02 {dm}^{2} \\ 3 {cm}^{2} 4 {mm}^{2} \times 30 = 3.04 {cm}^{2} \times 30 = 91.2 {cm}^{2}$

4м×3м

$4m \times 3m = 12 {m}^{2}$

6м×3м

$6m \times 3m = 18 {m}^{2}$

16см×12см

$16cm \times 12cm = 192 {cm}^{2}$

4см×4см

$4cm \times 4cm = 16 {cm}^{2}$

$192 {cm}^{2} \div 16 {cm}^{2} = 12$