Since one cm. = 10 mm., one square cm. = 10 x 10 = 100 sq. mm.
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None but 20 mm = 2 cm
1,800 mm x 310 mm = 0.558 sq meters.
7 cm 8 mm - 6 cm = 1 cm 8 mm = 1.8 cm or 18 mm
Convert to the same units then you can compare the numbers. 1 cm = 10 cm → 64 cm = 64 × 10 mm = 640 mm 640 > 630 → 640 mm > 630 mm → 64 cm > 630 mm → 64 cm is greater than 630 mm.
6.3 cm = 63 mm