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Convert to the same units then the addition can be done:

1 mm = 1/1000 m

→ 2.2 m + 900 mm = 2.2 m + 900 × 1/1000 m = 2.2 m + 0.9 m = 3.1 m

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7y ago

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It is 3.1 metres.

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7y ago
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Q: What is the total length 2.2 metre up and 900 milimetres below?
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