b) 6cm 4mm - 4cm 8 mm.
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Answer:
= 6 cm +4 mm- 4 cm+ 8 mm
= 6*10 mm+ 4 mm- 4*10 mm+ 8 mm
= 64 mm- 48 mm
= 16 mm
When we convert 16 mm into cm and mm,
= 16 mm/10
= 1 cm 6 mm
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