Question

4 mm + 0,2 cm = ? mm
456,123 cm - 579,237 mm = ? mm

Answer 1

4 mm + 0,2 cm = 4 mm +2 mm= 6mm

456,123 cm - 579,237 mm = 4561,23 mm - 579,237 mm =3981,993 mm

4 mm² + 0,2 cm² = 4 mm²+20mm²=24 mm²
1 cm ² =100 mm²
0,2 cm²=20 mm²