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Students work with relative sizes of units in 4.MD.1. Would it be expected that in 4th grade students know that 0.1 kg is more than 1 g, for example? Or 1/10 m is greater than 1 cm?
The “know relative sizes” in the standard is really about students knowing, for example, that 1 kg is 1000 times as large as 1 g. That said, they can do the comparisons you ask by expressing 0.1 kg as 100 g, or 1/10 m as 10 cm. Expressing larger units in terms of smaller units is part of the standard as well.
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