Dear student, We have,7m+45cm+81mmwe know 1cm=10mmso, 45 cm=45×10=450 mmalso, 1m=1000mm7m=7×1000=7000 mmthus the question becomes7m+45cm+81mm=7000mm+450mm+81mm=7531 mm Regards

7m+45cm+81mm

Dear student,

W e h a v e, 7 m + 45 c m + 81 m m w e k n o w 1 c m = 10 m m s o, 45 c m = 45 \times 10 = 450 m m a l s o, 1 m = 1000 m m 7 m = 7 \times 1000 = 7000 m m t h u s t h e q u e s t i o n b e c o m e s 7 m + 45 c m + 81 m m = 7000 m m + 450 m m + 81 m m = 7531 m m

Regards

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