2cm + 7.2cm + 6.9cm = 16.1
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91000 mm.
9 mm + 160 mm + 200 mm + 5 mm + 48 mm + 1.8 mm = 423.8 mm = 42.38 cm
First put the terms into equal units, resulting in 1.2 cm +12 cm. Simple addition shows this to be 13.2 cm or 132 mm.
I'm assuming that you mean 7.6 cm plus 4 millimeters/ And so the answer is 8 cm or 80 mm.
1 cm = 10 mm 8 cm = 80 mm 80 cm = 800 mm 86 cm = 860 mm 86.3 cm = 863 mm 86.36 cm = 863.6 mm