In units of length, 29 x 20 mm = 580 mm.If the question was intended to ask an area, then 29 mm x 20 mm = 580 square mm.
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29 cm is equal to 290 mm. To convert centimeters to millimeters, you multiply by 10 since there are 10 millimeters in a centimeter.
There are 16 16ths of a millimetre in a millimetre. so there are 20 x 16 16ths of a millimetre in 20 millimetres. 20 x 16 = 320.
2mm (cm x 10 = mm)
That is because 1 centimeter = 10 mm 20 cm = 20 x 10 = 200 mm In the metric system 1 meter = 10 decimeters = 100 centimeters = 1000 millimeters, etc.
There are 10 millimetres in one centimetre. Therefore, 2 centimetres is equal to 2 x 10 = 20 millimetres.