183 cm
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Convert to the same units, then the comparison and calculation can be made. 1 cm = 10 mm → 142 cm = 142 × 10 mm = 1420 mm 1420 > 1240 → the person 142 cm is taller. 1420 - 1240 = 180 mm → they are 180 mm = 180 ÷ 10 cm = 18 cm taller.
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
6 cm + 3 mm = 6.3 cm